lt1 bogging idle issues
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Joined: Jan 2018
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lt1 bogging idle issues
New to the site not a mechanic so bare with me in correct wording...bought a 97 z28 from somebodyhas a lt1 motor in it first problem I dealt with was a no spark changed the opti fixed the issue but now takes a couple cranks to turn over and run at idle...when running on idle seeing no issue when u step on pedal to hit the gas bogs down even if taking a ride around 1500 2000 rpms constant sputter bog feels like maybe a fuel air problems but I don’t no list of stuff done new opti new plugs wires coil map sensor tps sensormaf sensor crank position vehicle speed sensor o2 sensor battery scanned for codes only shows rear o2s and egr but the guy I bought it from deleted egr and has long tube headers so no rear o2s I ran a live data on car maybe this could help...just looking for right direction some say vacuum lines some say Possible clogged or idle air control..
Last edited by Nightrider1984; Feb 28, 2018 at 07:31 PM.
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Registered User
Joined: Jan 2018
Posts: 13
Re: lt1 bogging idle issues
Ok so I've been at this for awhile still running lean but new fuel filter checked all injector all working properly and friend sometimes getting a tune helps so I got a mail order power tune from lt1pcmtuning throw pcm back in cranks won't staying running so I took some carb cleaner sprayed the carb fires right up that cuts off could it be a leaky injector or is something else I could check for just need some advice or direction to check no vacuum leaks that I could find new air filter could it be iac valve? Or possibly the carburetor needs to be adjusted ?
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Re: lt1 bogging idle issues
Ok so I've been at this for awhile still running lean but new fuel filter checked all injector all working properly and friend sometimes getting a tune helps so I got a mail order power tune from lt1pcmtuning throw pcm back in cranks won't staying running so I took some carb cleaner sprayed the carb fires right up that cuts off could it be a leaky injector or is something else I could check for just need some advice or direction to check no vacuum leaks that I could find new air filter could it be iac valve? Or possibly the carburetor needs to be adjusted ?
1. Did you check the fuel pressure, as asked in post #2? If so:
- what is the pressure when the pump primes, without starting the engine?
- after the pump shuts off, how fast does the pressure drop?
- at idle, what is the fuel pressure with the vacuum compensation line off the fuel pressure regulator?
- what does the pressure drop to when you reattach the vacuum line?
2. “Carburetor”..... ? ? ? ?
Last edited by Injuneer; Mar 22, 2018 at 06:52 PM.
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