Ok I just finished an intake manifold gasket install, and now the car won't idle...it stalls immediately after starting unless you hit the gas, in which case it gives gas and then cuts gas repeatedly with some backfiring. I broke a t-connector for one of the vacuum hoses that connects to the back of the intake manifold so one of the hoses isn't on there too good and i can hear it leaking, and also a plastic vacuum line that connects to the underside of the front of the intake manifold which i used duct tape to reconnect...I don't know if I have some hoses switched around or some plug wires got switched around or if it's just too much unmetered air or what, any suggestions?
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I'm going to take a wild a$$ guess that your talking about a 4th Gen LT1, since you fixed an intake manifold leak - always a good idea to include a "signature" with year of the car, model, tranny, major mods, etc.
Will it idle if you hold the throttle blades open slightly? Might be a problem of not enough air to idle. Did you reconnect the idle air motor on the plate on the bottom of the throttle body? Is the MAF reconnected? Is the rubber inlet elbow on tight with no tears?
What vaccuum hose on the back of the intake did you break? There are some on the sides, butin the back, other than the line to the EGR valve. Did you try to stop the leak you can hear?
You've got to correct all the damage you did to the vacuum lines, and insure you have all the electronics reconnected correctly..... really sounds like a sloppy job.Fred
381ci all-forged stroker - 10.8:1 - CNC LT4 heads/intake - CC solid roller - MoTeC engine management - 8 LS1 coils - 58mm TB - 78# injectors - 300-shot dry nitrous - TH400 - Gear Vendor O/D - Strange 12-bolt - 4.11's - AS&M headers - duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP/800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117MPH straight motor
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Originally posted by twizted_3kgtoh sorry, it's a '88 L98...sloppy b/c 2 18 year old plastic vacuum lines broke? hmm. The maf and iac are connected, the vacuum line that broke on the rear was on the back pass side of the manifold, it goes in right next to the line for the fuel pressure regulator
My apologies.Fred
381ci all-forged stroker - 10.8:1 - CNC LT4 heads/intake - CC solid roller - MoTeC engine management - 8 LS1 coils - 58mm TB - 78# injectors - 300-shot dry nitrous - TH400 - Gear Vendor O/D - Strange 12-bolt - 4.11's - AS&M headers - duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP/800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117MPH straight motor
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fastTa
Originally posted by twizted_3kgtOk I just finished an intake manifold gasket install, and now the car won't idle...it stalls immediately after starting unless you hit the gas, in which case it gives gas and then cuts gas repeatedly with some backfiring. I broke a t-connector for one of the vacuum hoses that connects to the back of the intake manifold so one of the hoses isn't on there too good and i can hear it leaking, and also a plastic vacuum line that connects to the underside of the front of the intake manifold which i used duct tape to reconnect...I don't know if I have some hoses switched around or some plug wires got switched around or if it's just too much unmetered air or what, any suggestions?
Additionally the fact that you mentioned the car was backfiring would suggest that the timing is retarded way too much.
How did you set the timing and what did you set it to? At what RPM does the timing fully advance? You realize you have to unplug the timing lead and then set a zero base timing point correct?
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Ok I was just searching for some quick suggestions last night before I went to bed and this morning before work...considering I am a mechanic i'm definitely not taking it to one of my co-workers so they get paid off me lol.
Anyways I found the vacuum leak tonight after I got out of work, one of the intake runner gaskets got bent somehow right where the cold start injector plugs in...sprayed some soapy water there and it sucked it right up. Just have to fix that and it should run fine.
Thanks for the help guys.'88 Formula 350
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fastTa
How about the timing?
Originally posted by fastTAHow did you set the timing and what did you set it to? At what RPM does the timing fully advance? You realize you have to unplug the timing lead and then set a zero base timing point correct?
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