ok so my car runs great when im just driving it normal....but when i get on it and i get at about 4k or so it just boggs really bad and shutters....i dunno if it's not getting any fuel or what's going on....i did mess with the timing and i was off by a notch on the cams...but i had fixed that....i set teh timing at 20 deg....and i got on it and ran great ..then about 10 min later i was on the high way and i tried getting on it to see if any thing would happen it did the same thing just sputtering and a lil backfire....what's going on?...
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Could be a few things. They may not actually be related.
Idle wont adjust- check the throttle body and cable tension to make sure the butterfly is fully closing.
Sounds like it runs fine up to about 4K, except for the idle issue. Very well could be fuel. Check the filter, pump and regulator.
If it isn't fuel then my next guess is that you are dealing with unmetered air issues. Go over every thing that connects to the intake from the filter to the cylinders to check for leaks and that all the sensors are working as they should.
Haynes Manual and the FSM will be good friends in this.
I'm having a hard time thinking of one item that could cause both issues. Anyone have an idea on that?
I bet on fuel being the issue but sometimes its tough to say. :?Just stand back and throw money.
Performance costs money.
Reliable performance costs more.
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so...
ok so i set everything right and timing is set at 20 deg....it pulled really hard and ran good!! so i drove around a lil bit and then when i decided to try to get on it again it did the same thing!! it idles great now around 700k but it has a little popping to it...but i have no exhaust on it right now...just the elbow from the o2...and the o2 sensor is disconnected...could it be the o2 or could my pump not be pushing enough fuel...i have a fpr adjustable and it's set at about 45 right now....?
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Well,if it ran fine and then all of a sudden started running like crap and you found out it was the valve timing, then you fixed the valve timing and it ran great for a little bit and then all of a sudden started running like crap AGAIN.
I would say your tensioner keeps coming loose and your cams keep going out of time. Fix it or you will be replacing valves, and posibly pistons in no time.85 Z31 6.0 LSX turbo 766whp/792wtq
04 GTO, LS6, big cam, porting, N20... underway for summertime daily driver.
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Re: so...
JoshVG30ET wrote: ok so i set everything right and timing is set at 20 deg....it pulled really hard and ran good!! so i drove around a lil bit and then when i decided to try to get on it again it did the same thing!! it idles great now around 700k but it has a little popping to it...but i have no exhaust on it right now...just the elbow from the o2...and the o2 sensor is disconnected...could it be the o2 or could my pump not be pushing enough fuel...i have a fpr adjustable and it's set at about 45 right now....?Chuck Stong
300+ Parts and Performance owner
http://www.300-plus.com
2002 ZCOT president and always active member
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the idle surging is likely caused by the o2 sensor, even without air leaks you are getting extra fuel, the idle controls do adjust once in a while and it will idle up and down
but you gotta start diagnosing things, timing, compression, chts with harness resistance etc
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