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I'm having some problems with my 1994 sunbird and I was wondering if anybody knew of a good forum site for j-body cars. The car has a 2.0 4 cylinder and it's been giving me problems and I really have no idea what to do next.
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well since it is off topic, what kind of problems are they?If you aren't friends with a liar, you aren't friends with anyone. -
have a 1994 pontiac sunbird with a 2.0. Recently my car blew the head gasket between cylinders 3 and 4. I have since replaced the head gasket, and while the head was off I had it resurfaced and had a valve job done. I put it back together saturday and since I have done the head gasket the car has a very rough idle. At cold start it's not very bad, just a little rough and then as it warms up it gets much worse. Finally after it's been ran about 20 minutes the idle smooths out completely. The engine runs fine at any other speed except idle, any amount of throttle and it will smooth right out. I have checked and rechecked my vacum lines and i'm 99% sure they're on correctly and there are no leaks. My MAP sensor reads properly with the engine running (35-39 kp), again leading me to believe I have no vacum leaks. I checked my IAC, it's at 19 counts when ideling (about 900 rpms) and it seems to be moving properly. My oxygen sensor seemed to not be working properly, and upon inspection it was very corroded. I replaced it but my car still idles rough. I really have no idea what it could be. I was a little unsure of the way I lined up the timing when I put the car back together, but I would think that would make the car run bad no matter what the temp. I really have no idea where to go next, any help would be greatly appreciated.Comment
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double check the timing, if its off a tooth it may cause a bad idle. any more than one tooth would probly cause a problem over the entire range. essentialy you retarded the cam tming, and it probably moved all the power up a few hundred rpms from where it was, heck maybe you even got a few more hp around 6000rpm. probably not a big deal but cam timing is usally the #1 mistake made when doing up a motor.If you aren't friends with a liar, you aren't friends with anyone.Comment
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Hmm, I'm not so sure the cam would be off a tooth, if ONLY idle is effected.
My favorite J-body site would have to be www.v6z24.comComment
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are you using autozone parts? i think they get those from the delco reject bin.If you aren't friends with a liar, you aren't friends with anyone.Comment
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I had thought about the timing but I thought that would affect the whole RPM range. I was also unsure if the timing would be affected by how warm the engine is, once it's been driven for about 20 minutes the idle is fine again. It's not that bad at cold, gets worse as it warms up then goes away when it's hot. My book didn't tell me how to line the timing up, so I had a friend who just did a gasket on his 2.0 help me line it up. His runs fine, and he did it the same way on mine as on his. It doesn't mean it's right but I'm sure hoping it is, I don't want to try and line that up again unless I have to. We lined the crank up with the raised notch on the cover (I think it's about 10 degrees) and lined up the cam with the mark on the rear timing cover.Comment
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im not familiar with that motor so i don't really get the picture... maybe its an ignition thing.If you aren't friends with a liar, you aren't friends with anyone.Comment
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2.0L OHC, only found in the Sunbirds (Skyhawk and Firenza too).Originally posted by Doubt_IncarnateComment
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My car is distributorless so there is not ignition timing adjustment. I checked my timing and it was 1 tooth off. It took me 3 times but I got it timed again. My problem has gotten better but now I'm not sure the crank is lined up right with the timing marks. My friend who has a sunbird said to line up the crank with the larger mark on the timing cover, which appears to be 8 degrees. My chiltons book says to time my car at 10 degrees. My cover is kinda hard to read so I guess I'll try moving it 2 degrees back tomorrow and see what happens. I think I'm at least on the right track now, I'll keep messing with the timing until it works good again. Oh yeah, theres no Autozone parts on my car. We don't have one here but even if we did I wouldn't go anywhere near it.Comment
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The 10* reference is for ignition timing, which you can't adjust on yours.Originally posted by Carlspike
Your cam timing should be set to "0*"Comment
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I thought my cam timing should be at 0 also, but my book says to line my cam sprocket up with the mark on the rear cover and then line up the crank pulley at 10 degrees BTDC with the indicator scale. It sounds wierd I know, but a guy I know with the same engine did that and it's fine, I'll mess with it until I figure it out I guess..... stupid Brazilian engines.Comment
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i just did a head gasket on the weekend on a 2.0l turbo. the way you are setting the cam timing is incorect for your year
88 and earlier- line the cam up with the knotch in the timing cover, set the crank at 8 degrees btdc.
89-94- line the cam up with the mark in the top of the timing cover, line the crank sprocket up with the mark in the bottom of the timing cover.
your cam timing may be off.
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You're right! I just read my book under the right year and it says to line up both with the marks on the rear cover. Thank you for saving me a whole lot of hassle trying to time my car incorrectly. I guess my friend that timed it the other way just got lucky.Comment
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www.V6Z24.com has a lot of members who are strictly all about second gen j-bodies...i'd reccomend hopping over thereComment
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