mochilli
15+ Year Contributor
- 179
- 0
- Oct 6, 2007
-
Hamilton,
Where to start...ok, well i had my timing belt changed in July but the balancer shaft wasnt tensioned properly so i had that fixed like 3 weeks ago, i noticed the bad idle slightly after this but i dont remember if it was there before because from what i heard - if timing is off in the 4g63, i will grenade the engine...
The Problem:
Feel like a chugging in the engine at idle, at first the RPMs were normal, but two days ago i started it up and stalled it (first time im forever) needles to say, after that the car didnt want to start, i had to give it some gas a couple times and it finally started. Then the really crappy idle started...but it sounded ok above 1,100 rpms. We changed the BISS (set it to 1,100) and it sounded a lil better..but when i started driving it, it was idling at 1500 then jumping down to 1100 while idling at lights...it would stay at 1500 jump down to 1100 then back to 1500 after we set it to 1100 **warmed it up in the driveway b4 driving**.....we took it down to my bros shop and we checked the spark plugs (i just hand new plugs and wires put in like 3 months ago) they were fine...and we checked the injectors..well..he just took out the adapter and we would hear the change in engine noise and the rpm would dip down...and they all seemed fine...my bro is stumped since he doesnt know DSM's at allll and we asked another mech. who said it could be a vacuum leak but my bro said that would prob make the RPM's higher, regardless we checked and didnt notice any (that really flammable spray or w.e). When i turned it on and left the garage...it wasnt doing the 1500 - 1100 anymore..it was pretty steady at 1100..but still sounds like shit...like its chugging kinda thing....and when i turn it off...u really feel the chug as the engine stops. We also turned on all the accesories to make sure the ISC was working - the rpms dropped when everything was turned on...but did not quite come back all the way to where it was before with everything off (100-200rpm difference). We revved the engine up to 3000rpm and we didnt really feel the chug, at 2,000rpm you could feel it a lil more and at 1,500rpm you can really feel the chug....and its the worst at idle which is 1,000 right now...kinda like _____/\______/\_______/\______ if i had to draw what it felt like....
I've searched all the forums and can't find someone who has the same issue as me. i was doing research on possible problems: bad ISC, bad TPS, bad FIAV, new BISS o ring, boost leak, vacuum leak. But haven't ready of anyone with same symptons as me...is it possible for timing to be a lil off and not bend valves, do i have bent valves?....i dont think so...bc even when i go WOT, i havent noticed a hugeee change in performance. im trying not to drive my car at all right now unless i have to...please help
P.S there is no CEL light
The Problem:
Feel like a chugging in the engine at idle, at first the RPMs were normal, but two days ago i started it up and stalled it (first time im forever) needles to say, after that the car didnt want to start, i had to give it some gas a couple times and it finally started. Then the really crappy idle started...but it sounded ok above 1,100 rpms. We changed the BISS (set it to 1,100) and it sounded a lil better..but when i started driving it, it was idling at 1500 then jumping down to 1100 while idling at lights...it would stay at 1500 jump down to 1100 then back to 1500 after we set it to 1100 **warmed it up in the driveway b4 driving**.....we took it down to my bros shop and we checked the spark plugs (i just hand new plugs and wires put in like 3 months ago) they were fine...and we checked the injectors..well..he just took out the adapter and we would hear the change in engine noise and the rpm would dip down...and they all seemed fine...my bro is stumped since he doesnt know DSM's at allll and we asked another mech. who said it could be a vacuum leak but my bro said that would prob make the RPM's higher, regardless we checked and didnt notice any (that really flammable spray or w.e). When i turned it on and left the garage...it wasnt doing the 1500 - 1100 anymore..it was pretty steady at 1100..but still sounds like shit...like its chugging kinda thing....and when i turn it off...u really feel the chug as the engine stops. We also turned on all the accesories to make sure the ISC was working - the rpms dropped when everything was turned on...but did not quite come back all the way to where it was before with everything off (100-200rpm difference). We revved the engine up to 3000rpm and we didnt really feel the chug, at 2,000rpm you could feel it a lil more and at 1,500rpm you can really feel the chug....and its the worst at idle which is 1,000 right now...kinda like _____/\______/\_______/\______ if i had to draw what it felt like....
I've searched all the forums and can't find someone who has the same issue as me. i was doing research on possible problems: bad ISC, bad TPS, bad FIAV, new BISS o ring, boost leak, vacuum leak. But haven't ready of anyone with same symptons as me...is it possible for timing to be a lil off and not bend valves, do i have bent valves?....i dont think so...bc even when i go WOT, i havent noticed a hugeee change in performance. im trying not to drive my car at all right now unless i have to...please help
P.S there is no CEL light
Since i have a zero clearance head, wouldnt there be a bent valve if it was off one tooth even? or a cracked piston....???
...the guy i added to my msn lives in hamilton and he said hes buddy works on DSMs alot and asked him to do my clutch and he would for $300....so i dunno..do i save the $100 and go with this possible DSM guy or go for $400 for my mech. who i know will warranty me on any #### ups...perhaps ill ask this other guy if he will warranty me his work too...but i dont know him so he could say f*ck off for all i know...
