Car running horrible after LT install HELP???
Car running horrible after LT install HELP??? Just finished a set of Hooker Super Comps in my 98 Z28 and now a new set of problems show up... 
Car runs erratically wants to rev high to close to 2000 RPM then drop down to close to 600 RPM then idles at 900-1000. Any reason why?
Just replaced the plugs with TR-55's with out of the box gapping. Also I spliced the wires myself and made my own extensions could this contribute to the problem?
Will this cure itself once my Duals with bullets go on?
Lots of backfire on heavy acceleration, is this due to the car running rich?
Would the cheap free loaner scanner from Autozone help me pull the correct codes to be able to see whats going on?
Overall the car feels awkward with a dramatic amount of powerloss throughout all RPM... Please help car is undrivable any imput is helpful
(already went back and made sure all plug wires are connected completely)
Car sounds completely F***** badass open header though
Car runs erratically wants to rev high to close to 2000 RPM then drop down to close to 600 RPM then idles at 900-1000. Any reason why?
Just replaced the plugs with TR-55's with out of the box gapping. Also I spliced the wires myself and made my own extensions could this contribute to the problem?
Will this cure itself once my Duals with bullets go on?
Lots of backfire on heavy acceleration, is this due to the car running rich?
Would the cheap free loaner scanner from Autozone help me pull the correct codes to be able to see whats going on?
Overall the car feels awkward with a dramatic amount of powerloss throughout all RPM... Please help car is undrivable any imput is helpful
(already went back and made sure all plug wires are connected completely)
Car sounds completely F***** badass open header though
Staging Lane
Joined: Jan 2005
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From: Western PA
Originally Posted by james562
.....Lots of backfire on heavy acceleration, is this due to the car running rich?......
This may just be obvious but check and make sure your spark plug wires are pushed on enough. I got over eager to test out the headers when I put mine on and failed to push one of the plug wires on enough. I would also take the 2 O2 sensors you aren't using and make new extensions on them and see if they work better.
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Check your EGR tube/O-Ring that goes into the top of the manifold at the front...that will cause erratic behavoir if not connected right./cracked plugs/wires not on tight--you can hear them 'click' when on properly...
Last edited by NHRAMAN; Sep 15, 2006 at 01:55 PM.
I can't believe one one said this yet. You said you just put the plugs in? Mine were all over the place when I got mine. Take em' out and gap em' to .50!!! Its a piece of cake man. The gapping tool is maybe a dollar usually at the check out at parts stores.
Originally Posted by NHRAMAN
Check your EGR tube/O-Ring that goes into the top of the manifold at the front...that will cause erratic behavoir if not connected right./cracked plugs/wires not on tight--you can hear them 'click' when on properly...
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I've taken off my brake booster vacuum just to hear it idle and lope real hard with open headers. when I do that to mine, it doesn't wanna stay running till I play with it. So my experiece with leaks is that they don't idle high, but i've heard its probably true too.
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From: Vancouver,[KITSILANO].B.C. Canada *WestCoast*
Originally Posted by Starz T/A 17
If you have a vacum leak it will cause the irregular reving