I am having a weird issue with my car. Where the idle hunts and the afr fluctuate between 11.0 to 13.5.

I took the car off the road while running fine to upgrade the trans and do suspension upgrades and now i have this issue. I have been able in the past to promptly achieve a smooth idle at an ideal afr. Nothing i have tried seems to help

I have checked for vacum leaks. Changed gas. Calibrated 02. Verified fuel pressure and volume. New plugs.

Car is a 1970 bug with an 85 gslse 6port.
Stock ports
S5 intake and tb
Emissions removed
760cc primary injectors
480cc secondary
S5 fuel rails and regulator
Running COP with gm tuck coils
Rx8 mode enabled

 

Post a datalog of the issue.

 

How long of a datalog should i capture? I assume i should get it at cold start and after warm up?

 

Just a section of the log showing the idle hunting and running rich.

 

Oh, dumb question, but you didn't accidentally disconnect the MAP sensor line while doing the transmission work?

 

I verified that the map sensor is working and on a good vacum source

 

finally got an opportunity to get in the garage this morning. i shot a few longs one at cold start, another right at 160Deg coolant and one higher. i did notice that the TPS is fluctuating form -1 to 0 while just sitting there. i checked all my tps connections, i think the discrepancy might be in my 14 ft of throttle cable somewhere.

i shot a video thanks in advance for your help

 

Got a compression tester. With the engine warm and the schrader in the tool it pumped up to 115. With the schrader removed it went to 85-90 on both rotors. The vw starter turns these engines a little slow so i am confident it would be higher in an rx7. The motor is uner 7k miles on a rebuild. The plugs are kinda black condusive with very rich conditions. I am starting to think my 02 sensor could be faulty. Might borrow one from a friend and see if the readings are the same.

 

Datalog.

 

Yeah what you said. Lol

 

Aaron, have you had an opportunity to look at it? I am going to try again to find a vacuum leak and might change injectors for another set i have in the mean time.

 

Your CLT sensor seems to spike several degrees at one time. How is it grounded? Connector in good shape?

In the "cold start" log you are constantly hitting AE even though the TPS stays stationary, causing large spikes in fuel.

Actually this is present in all logs.

The VE table looks a little odd with a huge decrease in fuel just above idle at low RPM.

Your warmup enrichment goes from 103% at 130F to 110% at 160F. The car is always in warmup enrichment. That would explain the low values in the VE table. Warmup should be 100% at 160F.

Looking at your AE settings, try increasing the TPS threshold by a large amount, say 300% and see if that corrects much of the issue. Then decrease it until AE stops triggering without TPS movement or at very light movement. Looking at the spikes in the logs, I think you have a grounding issue causing voltage spikes on the CLT, and TPS line.

 

Thanks. I will try this later