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Tram
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 Posted: Wed Apr 20, 2016 10:13 am Post subject: Re: Fuel injection help!!! |
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Here are the factory "K" (fuel system) manual troubleshooting charts:
Looks like you're on the right track in suspecting the MAP if everything else checks out. See "engine not reaching full output" middle of the 2nd page.
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72squareguy
Samba Member
Joined: February 09, 2013
Posts: 111
Location: Victorville, CA
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| Posted: Wed Apr 20, 2016 11:05 am Post subject: Re: Fuel injection help!!! |
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| Yeah my car is Aug 71 so it's an early 72 but the system I bought is off a 73 I believe. |
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72squareguy
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Location: Victorville, CA
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| Posted: Wed Apr 20, 2016 11:11 am Post subject: Re: Fuel injection help!!! |
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| Maybe the presume sensor is losing vacuum? |
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sjbartnik
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Joined: September 01, 2011
Posts: 6000
Location: Brooklyn
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| Posted: Wed Apr 20, 2016 11:34 am Post subject: Re: Fuel injection help!!! |
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| 72squareguy wrote: |
| Maybe the presume sensor is losing vacuum? |
don't guess, test.
Use the troubleshooting charts that Tram posted.
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72squareguy
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Location: Victorville, CA
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| Posted: Thu Apr 21, 2016 9:39 am Post subject: Re: Fuel injection help!!! |
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I also have this trouble shooting guide from my Bentley manual. |
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Tram
Samba Socialist
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| Posted: Thu Apr 21, 2016 10:59 am Post subject: Re: Fuel injection help!!! |
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| 72squareguy wrote: |
I also have this trouble shooting guide from my Bentley manual. |
That works too! Just FYI- pressure switch is 1968/9 only. In 1970,full throttle enrichment moved to the MAP until 1973, when it was moved to the 5th prong on the TPS. They don't clarify this at all.
I'd suspect the throttle enrichment first on your setup.
However, you never did answer the question if this condition existed before the swap. I'm asking because a worn cam can cause this as can an exhaust blockage due to a baffle coming loose internally.
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72squareguy
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| Posted: Thu Apr 21, 2016 11:45 am Post subject: Re: Fuel injection help!!! |
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| Sorry Tram I didn't catch that question at first. No it didn't run like this with the twin carbs. |
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72squareguy
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Location: Victorville, CA
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| Posted: Thu Apr 21, 2016 12:22 pm Post subject: Re: Fuel injection help!!! |
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| An also when you Rev it up in neutral to that certain rpm when it wants to start "cutting in an out" it starts to blow black smoke like it's rich. |
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Tram
Samba Socialist
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Location: Still Feelin' the Bern- Once you've felt it you can't un- feel it.
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| Posted: Thu Apr 21, 2016 12:27 pm Post subject: Re: Fuel injection help!!! |
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| 72squareguy wrote: |
| An also when you Rev it up in neutral to that certain rpm when it wants to start "cutting in an out" it starts to blow black smoke like it's rich. |
What brand and heat range of spark plugs?
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72squareguy
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| Posted: Thu Apr 21, 2016 12:43 pm Post subject: Re: Fuel injection help!!! |
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| I know they're bosch plugs. Don't know what heat range they are. I will put one out in a little bit and give you the number. |
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Tram
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| Posted: Thu Apr 21, 2016 12:58 pm Post subject: Re: Fuel injection help!!! |
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| 72squareguy wrote: |
| I know they're bosch plugs. Don't know what heat range they are. I will put one out in a little bit and give you the number. |
OK, if they are made anywhere but Germany and/ or if they are Platinum they need to go.
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Donnie strickland
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Joined: December 21, 2009
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Location: Moody, AL
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| Posted: Thu Apr 21, 2016 3:06 pm Post subject: Re: Fuel injection help!!! |
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| Tram wrote: |
| 72squareguy wrote: |
| I know they're bosch plugs. Don't know what heat range they are. I will put one out in a little bit and give you the number. |
OK, if they are made anywhere but Germany and/ or if they are Platinum they need to go. |
I can only get Russian-made Bosch W8AC plugs now. For whatever it's worth, they work perfectly in my car.
72squareguy, check your plug wires. Inspect them carefully for cracks or splits, and watch them with the engine running in the dark. If any of them have any spots along the wire where it's glowing blue, it's a bad one.
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72squareguy
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| Posted: Thu Apr 21, 2016 4:53 pm Post subject: Re: Fuel injection help!!! |
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Bosch plugs.... WR8AC+RUSSIA |
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72squareguy
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Location: Victorville, CA
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| Posted: Thu Apr 21, 2016 4:54 pm Post subject: Re: Fuel injection help!!! |
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Plugs look like its extremely rich.
Also here is where my throttle switch adjustment is set at...
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Tram
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| Posted: Thu Apr 21, 2016 5:07 pm Post subject: Re: Fuel injection help!!! |
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| 72squareguy wrote: |
Plugs look like its extremely rich.
Also here is where my throttle switch adjustment is set at...
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Did you set it up per Bentley?
How is the valve adjustment?
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72squareguy
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Location: Victorville, CA
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| Posted: Thu Apr 21, 2016 5:18 pm Post subject: Re: Fuel injection help!!! |
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| Yes I set exactly how the book wanted it. I ran thru the valves this morning. Funny thing is they weren't tight to where they had no clearance bug they seemed a little tight for me. I set them at .007 and it ran a little different at idle. Are these systems that sensitive to valve adjustment or is it just my imagination? |
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72squareguy
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Location: Victorville, CA
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| Posted: Thu Apr 21, 2016 5:31 pm Post subject: Re: Fuel injection help!!! |
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| I think you may be on to something about the throttle enrichment Tram. I pulled off the connector for the throttle switch then plugged it back and now it's doing its little issue at an even HIGHER rpm! |
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Tram
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Posts: 22729
Location: Still Feelin' the Bern- Once you've felt it you can't un- feel it.
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| Posted: Thu Apr 21, 2016 7:38 pm Post subject: Re: Fuel injection help!!! |
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| 72squareguy wrote: |
| Yes I set exactly how the book wanted it. I ran thru the valves this morning. Funny thing is they weren't tight to where they had no clearance bug they seemed a little tight for me. I set them at .007 and it ran a little different at idle. Are these systems that sensitive to valve adjustment or is it just my imagination? |
Very sensitive to manifold vacuum which valve adjustment affects directly.
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Tram
Samba Socialist
Joined: May 02, 2003
Posts: 22729
Location: Still Feelin' the Bern- Once you've felt it you can't un- feel it.
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| Posted: Thu Apr 21, 2016 7:40 pm Post subject: Re: Fuel injection help!!! |
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| 72squareguy wrote: |
| I think you may be on to something about the throttle enrichment Tram. I pulled off the connector for the throttle switch then plugged it back and now it's doing its little issue at an even HIGHER rpm! |
Just for fun, loosen your set screws on the TPS so that it will move if you move it but not just flop, run it, and while you run it see if you can get the TPS in a happy spot where it doesn't do it at all. You may simply be hitting full throttle enrichment way too early.
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72squareguy
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Location: Victorville, CA
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| Posted: Fri Apr 22, 2016 6:41 pm Post subject: Re: Fuel injection help!!! |
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| Hey tram. I tried to find the happy spot for the throttle switch. Couldn't find one. Nothing changed. But this is my latest, as I had the throttle wide open in neutral it was doing its little issue then it worked passed it for a sec then popped loudly back thru the intake. |
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