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72squareguy
Samba Member
Joined: February 09, 2013
Posts: 111
Location: Victorville, CA
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 Posted: Thu May 05, 2016 2:11 pm Post subject: Re: Fuel injection help!!! |
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I don't have an original pump on it I have the late model L-jet bus style pump.
Once I put it at 28/29 it was pretty steady. Reving it up and down it was changing. I got it to the point where it was doing its stupid little rev limited thing. Pressure maintained right where I put it. Bumping it up or down wasn't affecting idle speed.
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Miked914
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Joined: August 18, 2009
Posts: 127
Location: Santa Clarita, CA
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| Posted: Fri May 06, 2016 2:56 pm Post subject: Re: Fuel injection help!!! |
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You mentioned that you swapped the TPS a couple of times. But did you check to see if it working, perhaps the wiring to it is bad.
With engine off and key/electric switched on you should be able to hear the injectors click as you turn the throttle by hand. 21 times I think.
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Mike D.
'68 Fastback w/T4
'74 Porsche 914-6 3.0 Hot Rod
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72squareguy
Samba Member
Joined: February 09, 2013
Posts: 111
Location: Victorville, CA
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| Posted: Fri May 06, 2016 3:19 pm Post subject: Re: Fuel injection help!!! |
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| Miked914 wrote: |
You mentioned that you swapped the TPS a couple of times. But did you check to see if it working, perhaps the wiring to it is bad.
With engine off and key/electric switched on you should be able to hear the injectors click as you turn the throttle by hand. 21 times I think. |
Yes I've put 2 different throttle switches on. The first one when I adjusted it per bentley, you can hear it click once then the book wants you to go two notches on the degree wheel after the click. So you should hear the click when you first open the throttle. Which it did. Now the second one did the same thing but clicked twice. Once when u first open the throttle then again at about half throttle.
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72squareguy
Samba Member
Joined: February 09, 2013
Posts: 111
Location: Victorville, CA
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| Posted: Sat May 07, 2016 5:22 pm Post subject: Re: Fuel injection help!!! |
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Tuning in again here,
I had some time to screw with the car today after work. I did just discover a vacuum leak at the AAR. I pulled off the hose between the AAR and IAD and it looked fine. I put it back on and tightened the hose clamps. It still has a leak right there. Now, I don't have a base gasket on the AAR where it meets the case. I just have some silicone on there to prevent and oil leak. I don't think not having that gasket there would cause a vacuum leak would it?
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72squareguy
Samba Member
Joined: February 09, 2013
Posts: 111
Location: Victorville, CA
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| Posted: Tue May 10, 2016 12:23 pm Post subject: Re: Fuel injection help!!! |
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So does anyone know if JSMskater is still building the harnesses for these F.I systems? Ive seen them before and they sure look bitchin! His website doesn't work. I would to get one of those bad boys!
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KTPhil 
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Joined: April 06, 2006
Posts: 34000
Location: Conejo Valley, CA
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| Posted: Tue May 10, 2016 1:19 pm Post subject: Re: Fuel injection help!!! |
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| 72squareguy wrote: |
| So does anyone know if JSMskater is still building the harnesses for these F.I systems? Ive seen them before and they sure look bitchin! His website doesn't work. I would to get one of those bad boys! |
This guy does nice work, too:
http://bowlsby.net/914/WiringHarnesses/
Expect to pay about four bills. |
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Tram
Samba Socialist
Joined: May 02, 2003
Posts: 22711
Location: Still Feelin' the Bern- Once you've felt it you can't un- feel it.
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| Posted: Tue May 10, 2016 4:11 pm Post subject: Re: Fuel injection help!!! |
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| 72squareguy wrote: |
| So does anyone know if JSMskater is still building the harnesses for these F.I systems? Ive seen them before and they sure look bitchin! His website doesn't work. I would to get one of those bad boys! |
PM him through here. I think he discovered jobs and wimmin, aka "real life". 
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| Just my hands. And a little lube. No tools. |
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72squareguy
Samba Member
Joined: February 09, 2013
Posts: 111
Location: Victorville, CA
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| Posted: Tue May 10, 2016 9:24 pm Post subject: Re: Fuel injection help!!! |
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| Tram wrote: |
| 72squareguy wrote: |
| So does anyone know if JSMskater is still building the harnesses for these F.I systems? Ive seen them before and they sure look bitchin! His website doesn't work. I would to get one of those bad boys! |
PM him through here. I think he discovered jobs and wimmin, aka "real life". |
I talked to the guy from the link that KTPhil sent. He says I can either send him my harness for repairs or he can build me a new one with all new connectors.
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KTPhil
Samba Member
Joined: April 06, 2006
Posts: 34000
Location: Conejo Valley, CA
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| Posted: Tue May 10, 2016 10:31 pm Post subject: Re: Fuel injection help!!! |
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| 72squareguy wrote: |
| I talked to the guy from the link that KTPhil sent. He says I can either send him my harness for repairs or he can build me a new one with all new connectors. |
Yup. I wanted to keep my car running in the meantime, so I bought one outright. The risk here is that the wire lengths are somehow different; if he has your old one he can duplicate it exactly. I haven't put mine on yet-- maybe this weekend. But it sure looks well-made.
Another option is to consider newer-style female connectors inside the plastic connector housings. This may require some filing/dremeling to let them fit. There may be an advantage on longevity/reliability with the so-called "double-cantilever" style. Search for threads on these and decide for yourself. |
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72squareguy
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Joined: February 09, 2013
Posts: 111
Location: Victorville, CA
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| Posted: Thu May 12, 2016 5:33 pm Post subject: Re: Fuel injection help!!! |
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So my used harness showed up in the mail today. I bought another one from Roadbeater on here. It's actually in better shape than the one that is on my car. Gonna clean all the connectors and throw it on the car.
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72squareguy
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| Posted: Sun May 15, 2016 8:21 pm Post subject: Re: Fuel injection help!!! |
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Is there a way to test these throttle switches with a multi meter? If so, can someone tell me what to look for.. 5 prong switch
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72squareguy
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Location: Victorville, CA
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| Posted: Sat May 28, 2016 6:47 pm Post subject: Re: Fuel injection help!!! |
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Ugghh... still no luck with this thing... I have a different harness on it now which I AM hearing the injectors click maybe 20 times as I open the throttle with the key "ON". It wasn't doing that with my old harness.
I purchased another MAP sensor. Part # 311 906 051 E. Put that on... Ran worse! Didn't even wanna idle. And yes I did make sure the was plugged in the correct way. Tram did mention a worn out cam can cause this issue. I'm starting to wonder if that's right problem. This motor does have about 8k miles on it. But... in January (few months ago) this motor did seize up on me. I yanked it apart and did a quick rebuild. The cause of it seizing was the thrust main bearing. When I rebuilt it all I did was put all new bearings in it. I didn't think a cam & lifter set was necessary since it only had 8k. Maybe the cam went flat on me... don't know..... I'm lost 
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Tram
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Joined: May 02, 2003
Posts: 22711
Location: Still Feelin' the Bern- Once you've felt it you can't un- feel it.
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| Posted: Sun May 29, 2016 9:06 am Post subject: Re: Fuel injection help!!! |
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| 72squareguy wrote: |
Ugghh... still no luck with this thing... I have a different harness on it now which I AM hearing the injectors click maybe 20 times as I open the throttle with the key "ON". It wasn't doing that with my old harness.
I purchased another MAP sensor. Part # 311 906 051 E. Put that on... Ran worse! Didn't even wanna idle. And yes I did make sure the was plugged in the correct way. Tram did mention a worn out cam can cause this issue. I'm starting to wonder if that's right problem. This motor does have about 8k miles on it. But... in January (few months ago) this motor did seize up on me. I yanked it apart and did a quick rebuild. The cause of it seizing was the thrust main bearing. When I rebuilt it all I did was put all new bearings in it. I didn't think a cam & lifter set was necessary since it only had 8k. Maybe the cam went flat on me... don't know..... I'm lost |
Were they .040 non steel backed bearings?
If it's a new cam it's possible. New stuff just isn't made like the old stuff. Pull a valve cover, turn the engine over by hand, and measure your lift.
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| Bryan67 wrote: |
| Just my hands. And a little lube. No tools. |
To best contact me, please use the EMAIL function in my profile |
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72squareguy
Samba Member
Joined: February 09, 2013
Posts: 111
Location: Victorville, CA
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| Posted: Sun May 29, 2016 3:49 pm Post subject: Re: Fuel injection help!!! |
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| Tram wrote: |
| 72squareguy wrote: |
Ugghh... still no luck with this thing... I have a different harness on it now which I AM hearing the injectors click maybe 20 times as I open the throttle with the key "ON". It wasn't doing that with my old harness.
I purchased another MAP sensor. Part # 311 906 051 E. Put that on... Ran worse! Didn't even wanna idle. And yes I did make sure the was plugged in the correct way. Tram did mention a worn out cam can cause this issue. I'm starting to wonder if that's right problem. This motor does have about 8k miles on it. But... in January (few months ago) this motor did seize up on me. I yanked it apart and did a quick rebuild. The cause of it seizing was the thrust main bearing. When I rebuilt it all I did was put all new bearings in it. I didn't think a cam & lifter set was necessary since it only had 8k. Maybe the cam went flat on me... don't know..... I'm lost |
Were they .040 non steel backed bearings?
If it's a new cam it's possible. New stuff just isn't made like the old stuff. Pull a valve cover, turn the engine over by hand, and measure your lift. |
They are .020 steel bearings (Silverline)
The cam and lifter set I bought new in 2013 when I did a full rebuild on my motor which only 3 years due to the thrust bearing. It had 8k on it so I put those lifters and cam back in it.
I will measure the lift when I get a chance. I got so damn frustrated yesterday I had to walk away! LOL
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raygreenwood
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Joined: November 24, 2008
Posts: 21511
Location: Oklahoma City
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| Posted: Sun May 29, 2016 8:13 pm Post subject: Re: Fuel injection help!!! |
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| 72squareguy wrote: |
| Is there a way to test these throttle switches with a multi meter? If so, can someone tell me what to look for.. 5 prong switch |
If you are using the four or five pin switch.....the Bentley is poor for adjusting instructions. It tells you basic adjustment method but does not tell you to.....or how 5o cycle the switch and then recheck the adjustment ....and to possibly readjust to account for the two layers of slop/ tolerance....one from the nylon "D" chuck on the shaft of the wiper hub and two from the wear and tolerance from the floating forked switch and three.....from the variance that is in the metal pins of the forked switch from various build levels ovef the years.
I did a TPS adjusting thread that may be here if not I have a copy somewhere. Ray |
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72squareguy
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Joined: February 09, 2013
Posts: 111
Location: Victorville, CA
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| Posted: Tue May 31, 2016 8:42 pm Post subject: Re: Fuel injection help!!! |
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| raygreenwood wrote: |
| 72squareguy wrote: |
| Is there a way to test these throttle switches with a multi meter? If so, can someone tell me what to look for.. 5 prong switch |
If you are using the four or five pin switch.....the Bentley is poor for adjusting instructions. It tells you basic adjustment method but does not tell you to.....or how 5o cycle the switch and then recheck the adjustment ....and to possibly readjust to account for the two layers of slop/ tolerance....one from the nylon "D" chuck on the shaft of the wiper hub and two from the wear and tolerance from the floating forked switch and three.....from the variance that is in the metal pins of the forked switch from various build levels ovef the years.
I did a TPS adjusting thread that may be here if not I have a copy somewhere. Ray |
I see what you're saying, I personally don't think its the throttle switch. Where ever I put it its not changing anything. Mine is the 5 prong switch.
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72squareguy
Samba Member
Joined: February 09, 2013
Posts: 111
Location: Victorville, CA
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| Posted: Tue May 31, 2016 8:45 pm Post subject: Re: Fuel injection help!!! |
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| Tram wrote: |
| 72squareguy wrote: |
Ugghh... still no luck with this thing... I have a different harness on it now which I AM hearing the injectors click maybe 20 times as I open the throttle with the key "ON". It wasn't doing that with my old harness.
I purchased another MAP sensor. Part # 311 906 051 E. Put that on... Ran worse! Didn't even wanna idle. And yes I did make sure the was plugged in the correct way. Tram did mention a worn out cam can cause this issue. I'm starting to wonder if that's right problem. This motor does have about 8k miles on it. But... in January (few months ago) this motor did seize up on me. I yanked it apart and did a quick rebuild. The cause of it seizing was the thrust main bearing. When I rebuilt it all I did was put all new bearings in it. I didn't think a cam & lifter set was necessary since it only had 8k. Maybe the cam went flat on me... don't know..... I'm lost |
Were they .040 non steel backed bearings?
If it's a new cam it's possible. New stuff just isn't made like the old stuff. Pull a valve cover, turn the engine over by hand, and measure your lift. |
I screwed with it a bit today. I didn't get to measuring the valve lift yet. But... its doing the little thing now where the idle is going uuuupppp and dooooowwnnn over an over. Then if I unplug the air temp sensor (the one on the throttle body) it''ll smooth itself out. LOL this thing is getting worse and worse.... 
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KTPhil
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| Posted: Tue May 31, 2016 10:38 pm Post subject: Re: Fuel injection help!!! |
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I've seen two kinds of up-down swings.
The "big-up" swing is when the throttle is closed but you have a big air leak. The idle swings up to maybe 1800 rpm or so, then the cut-off circuit kills injection until the idle drops back down to normal, then it repeats.
The "little-down" swing is from a too-lean idle mixture, and I'm less sure of the mechanics. It will fall to almost die, then pick up again to al title above normal, then repeat.
Which are you seeing? |
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72squareguy
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Joined: February 09, 2013
Posts: 111
Location: Victorville, CA
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| Posted: Wed Jun 01, 2016 8:30 am Post subject: Re: Fuel injection help!!! |
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| KTPhil wrote: |
I've seen two kinds of up-down swings.
The "big-up" swing is when the throttle is closed but you have a big air leak. The idle swings up to maybe 1800 rpm or so, then the cut-off circuit kills injection until the idle drops back down to normal, then it repeats.
The "little-down" swing is from a too-lean idle mixture, and I'm less sure of the mechanics. It will fall to almost die, then pick up again to al title above normal, then repeat.
Which are you seeing? |
Hmmmmmm, sounds to me like I have the "little swing".
As it does this the response to the throttle "closing" is terrible. Kinda like its doing its little swing, I barely tap the throttle open and itll idle way up for maybe 3 secs then drop down. It was doing this before when I first put the system on I never figured it out, then the engine seized and had to do the quick rebuild. Once I got it running again it stopped doing it.
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72squareguy
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Posts: 111
Location: Victorville, CA
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| Posted: Fri Jun 03, 2016 7:06 pm Post subject: Re: Fuel injection help!!! |
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Where are the Injectors grounding? I know that they all connect in the center of the engine case to one connector but what about after that? Do they ground down all the way to the ground strap on trans? If so, I may have an issue. My ground strap is all trashed. Looks like its been there for 100 years.
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