rebuilt engine and now it doesn't run right.

[95_tsi_awd]

i have a 95 eagle talon, i rebuilt the engine (rod bearings crank bearings, pision rings, honed cylanders and new gaskets) when i started it up it sputtered a little bit then idled like crap and died. i cyled the key a few times to build fuel pressure and it started right up and idled fine. after a few minutes of ideling i tryed to raise the rpms, i bearly pressed the gas and it ackted like there was a huge load on the engine. after it got up to 2500 rpm it reved fine but only when you lightly press the gas. if you try to rev it quickly it bulds boost and acts like there is a huge load on the engine. i can hit peak boost just reving it to 4000 rpm. and when you let off the gas it wants to die. i cheaked all the eletrical connectors and all vacuume lines and all are fine, also i cheaked timing multiple times and all points line up. when it idles rough it has 10 in of vacuume with a shakey needle and when it idles at 900rpm it has around 18 in of vacuume with a steady needle. please tell me what you think.

 

[govproperty]

That idle vacuum is low. I guessing you have stock cams since you profile says stock. But you could try to do a boost/vacuum leak lest to see if there is a leak somewhere. Just a shot in the dark, did you line the notch on the CAS tab up with TDC.

 

[95_tsi_awd]

yea sure did. after i ran it for a while i let it cool and pulled the plugs and they were white so its running real lean. and when i had it running i sprayed carb cleaner all on the intake and vacuume lines to see if it changed idle and nothing. i will get the smoke tester from work and smoke test the intake.

 

[95_tsi_awd]

o and i hooked up my dvom to the o2 sensor and it said it was running lean, do you think it could be the pcm? and when i pulled the plugs they were all white, not just one or two so makes me think its not clogged injectors.

 

[govproperty]

It could be the ecu but seeing that you just rebuilt the engine it would be likely that it would have something with that. You could always pull to the ecu and check the caps. That shouldn't take that long. But I haven't heard of a lot of 2g's having bad caps. Did you remove any of the honeycombs in the mas? Have you set your ignition timing?

 

[9d1gsxintx]

Did you double check that everything is hooked up, such as the knock sensor, etc. It sounds like it is retarding the timing on you, when you idle up. I would try to hook up a timing light and make sure you are spot on, and just start eliminating one thing after the other. I know how you feel, I spent 3 weeks sourcing out electrical and vacuum problems on a fresh build. If you have friend with a 2g, you might try his/hers ECU, just to see if it cures it. Good luck.

 

[95_tsi_awd]

no i didn't remove any honey come from the mas. and i double and tripple checked all the connections and vacuume lines. but ill check again. i will test all the major sensors tonight.

 

[95_tsi_awd]

also how do you set your ignition timing with it not having a distributor?

 

[govproperty]

You set it by turning you cam angle sensor. Go to vfaq.com click the dsm link then the engine link. There is two articles there covering how to set base ignition timing. Also, you could buy a hayes, chilton or service manual. I would suggest the factory manual. I believe machv sells them on CD and I think JNZ tuning has them too. Check the vendors section on this website if you still can't find it.

 

[JusMX141]

also how do you set your ignition timing with it not having a distributor?

You set it by turning you cam angle sensor.

That might work if '95's didn't have a fixed cam angle sensor.



Did you try to keep the car running for a while? My buddy's '95 runs horrible for a good while after the ECU has been disconnected for an extended period of time.

 

[govproperty]

Yea, you are right. I forget that not a 4g63's are the same. I did find this thread on 2ga base timing but it said the same thing that jusmx141 said. http://www.dsmtuners.com/forums/newbie-forum/216306-how-do-you-adjust-base-timing-2g.html
Did you check for vacuum leaks yet?

 

[95_tsi_awd]

i have whent over every hose and sprayed it with carb clean while it was runnig but thats about it. one of the guys that i work with said to start it up and rev it, and spray some fuel in there to see if it revs faster, that would narrow it down to a fuel problem. but i will run it some more and see what it does, but i dont want to run it too much because of how lean its running. the other day i drove it like 50 feet and when i got out and looked at the manifold and turbo they were glowing cherry red, so thats no good.

 

[empie1]

Your timing is off.

 

[Colt4G63 also]

Are you sure your cam timing is correct? It sounds like your combusting out through your exhaust valves if it turns everything red in only 50' of driving.

 

[95_tsi_awd]

im sure. alll the marks line up, and when i turned the crank over 2 times the marks l;ined back up. also when i hooked up a scan tool it kept on advancing the timing. when i started it was 5 degrees advanced and right b4 i shut it off it was 26 degrees.

 

[95_tsi_awd]

would it still run if the crank was one tooth off?

 

[brassc2007]

yes it would still run if the crank is off a tooth or two just out of curiousity, when you did the timing did you make sure that the dowel pins where in the up position?

 

[95_tsi_awd]

on the cam? i didn't pay any attetion honestly. the numbers stamped into the cam sprockets were right side up.

 

[empie1]

That doesnt mean thing.No offense man but you really need to read up on somethings.Im telling you your timing is off.It will start and run even if its off a tooth.Use your brain, logically, why would your car be running lean without any vac leaks? Do you really have a good understanding of how your engine operates?Im thinking no...The fact that you "didnt pay attention" to something as critical as dowel pin position leads me to believe you might be out of your league.

 

[Calan]

Please don't take offense to this, but you really, REALLY need to do a lot of studying or get someone knowledgable with your car to come help you in person. Based on some of your comments, I think it could be almost anything, and I'm afraid you don't have the experience (yet) to safely find the problem.

Again...I'm not trying to be an ass... I just don't want to see you destroy your newly built engine while trying to get it running.

Good luck!

 

[brassc2007]

ok on another note lets get him on track thats why we are here right. So yes i was talking about the cam sprockets. So what you need to do is pull the timing cover off the side of the motor and line up the crankshaft line to the tdc (top dead center) mark. After you do that you need to check and make sure your balance shaft is pointing to the correct mark, if you have not done the balance shaft delete kit, and then check to see if your cam gears are lined up and the dowel pins are on top of the cams pointing up if all that is dead on then timing is not your issue but if one of them is off then you need to redo your timing and pay just a little more attention. A very good toturial is Timing Belt VFAQ follow this and you will be fine. If you have any questions post here or pm me. I wish you the best of luck and dont worry bout bein put down you dont learn without an error or two along the way.

 

[brassc2007]

sorry i made a mistake so i will correct myself on your motor there is no balance shaft unless you swapped in a 4g63 from a first gen but there is the oil pump sprocket and that does need to be lined up too.

 

[brassc2007]

sorry i feel dumb it does have a balance shaft but its on a separate belt, im out of it today since i just got off work.

 

[empie1]

sorry i feel dumb it does have a balance shaft but its on a separate belt, im out of it today since i just got off work.

YEah I was wondering where the no balence shafts on a 2g came from..

 

[EVO_THREE]

Your cams are 180 out