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Unread 02-09-2013, 12:55 AM   #1
87TPIYJ
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1987 YJ Wrangler 
 
Join Date: Feb 2009
Location: Jacksonville, Florida
Posts: 834
Chevy 350 TPIi code 43

So I have had this FI set up for 7 or so years. It is a TPI set up out of a 92 camaro. My jeep barely ever gets driven due to the normal one thing after another problems. Anyways I have I've been putting a lot of time in it lately to get everything running the way it should. It was a gas hog (6-7mpg). In September I found major vacuum leaks and mis routed vacuum lines. I fixed all of that and I noticed it was not running nearly as rich as it was before- good thing. Then the tranny died 2 days later-bad thing.
I have always thrown an engine code since the swap (24-VSS and 43-knock sensor). I have replaced the sensor twice. It doesn't clear The code. I just finished a trans swap that I now have an electric VSS. I noticed that when it was cold it would run real crappy for a couple of minutes. So I decided to pull codes tonight and got 24 and 43. So I decided to wire up the VSS to the computer to at least get rid of one code. Now it runs super rich and when the tires move the engine basically dies. I can sit there and rev it all I want not moving, but the minute I move the engine dies. I am now assuming my computer allowed me to drive before without because it never knew the wheels were turning. I have read it could, be bad knock, bad wire to knock, or the ESM. I also gather that because of this my computer could be taking out as much as 20 degrees of timing. Hence it dying. I have a feeling it's my computer that is bad. Before I write my life story, I'm just wondering if anyone else with TPI swaps has had similar problems. Thanks

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87 YJ, 350 TPI, 35x12.50x17, SOA, HPD30 locked, 8.8LSD, TT
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Unread 02-09-2013, 07:07 AM   #2
87TPIYJ
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1987 YJ Wrangler 
 
Join Date: Feb 2009
Location: Jacksonville, Florida
Posts: 834
Well I put my theory to test this morning. I unplugged the Harness from the VSS and I can drive it around. I pretty sure the underlying problem is a bad ESM.
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87 YJ, 350 TPI, 35x12.50x17, SOA, HPD30 locked, 8.8LSD, TT
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Unread 02-11-2013, 01:46 PM   #3
87TPIYJ
Registered User
1987 YJ Wrangler 
 
Join Date: Feb 2009
Location: Jacksonville, Florida
Posts: 834
Got code 43 cleared ended up when i got the old sensors I some how recieved the wrong one and it was reading 100k ohms. Got a new one that is 3.9K ohms and code 43 is gone. VSS still an issue, but thats for a new thread.
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87 YJ, 350 TPI, 35x12.50x17, SOA, HPD30 locked, 8.8LSD, TT
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