First off I want to thanks Teamrx8 for the tip and my SARX brothers for the hand wrenching.
I had an issue where all of the sudden my car started going pig rich and my STFT and LTFT at idle were -20 +20 % (should be within 3% of 0 +/-). Right away I assume a boost leak and so I grab out trusty home made boost leak tester made up of a fog machine and go to work. Well after testing everything in sections, I found no boost leaks or vacuum leaks. So then I tested the Synapse DV thinking it may be leaking internally, and nope it was fine. So then I start thinking compression but zero oil in my catch can and the car starts perfectly and idles perfectly (despite wacky fuel trims) when fully hot. Fuel pressure was good, oil pressure was good, everything was good.
Anyway, I get to talking Teamrx8 and recalls a situation a guy had where the symptoms were similar and that he ended up replacing the throttle body and that fixed it. Well, I recently purchased a new throttle body from RP @ AFE just to replace mine that had 10+ years and 143,000 miles on it.
So I slap the old throttle body back on and go for a spin and everything is perfect. I have a few throttle bodies laying around, I could have saved myself a lot of hassle just swapping the throttle body in the first place, :lol:
Just thought I would share in case anyone else is chasing an issue like this. I had a issue similar to this that was tune related but since I was recently retuned and the car was running well, I knew this was not tune related since it happened so suddenly.
Oh and my fog machine/boost leak tester that works great.
I had an issue where all of the sudden my car started going pig rich and my STFT and LTFT at idle were -20 +20 % (should be within 3% of 0 +/-). Right away I assume a boost leak and so I grab out trusty home made boost leak tester made up of a fog machine and go to work. Well after testing everything in sections, I found no boost leaks or vacuum leaks. So then I tested the Synapse DV thinking it may be leaking internally, and nope it was fine. So then I start thinking compression but zero oil in my catch can and the car starts perfectly and idles perfectly (despite wacky fuel trims) when fully hot. Fuel pressure was good, oil pressure was good, everything was good.
Anyway, I get to talking Teamrx8 and recalls a situation a guy had where the symptoms were similar and that he ended up replacing the throttle body and that fixed it. Well, I recently purchased a new throttle body from RP @ AFE just to replace mine that had 10+ years and 143,000 miles on it.
So I slap the old throttle body back on and go for a spin and everything is perfect. I have a few throttle bodies laying around, I could have saved myself a lot of hassle just swapping the throttle body in the first place, :lol:
Just thought I would share in case anyone else is chasing an issue like this. I had a issue similar to this that was tune related but since I was recently retuned and the car was running well, I knew this was not tune related since it happened so suddenly.
Oh and my fog machine/boost leak tester that works great.
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