90 galant gsx 1/2 cylinders no comp? FIXED

[Wizardawd]

Since it is 2 adjoining cylinders, could be a head gasket. Usually it won't bend just a couple valves at speed. All the valves will smack.

And since it wasn't mentioned. Check timing belt alignment. Out of 30+ DSMs I picked up from people, if the CAS was cranked a lot on the advanced side, it was because they had the intake cam off one tooth and tried to compensate by advancing the timing to smooth it out. And a bad alignment also lead to finding bad hydraulic timing adjuster (gotta compress it slow or it ruins it- if you can compress it with your thumb, it's no good)) which caused the timing belts to jump time eventually. Bad work equals bad results.

Wiz

 

[MellowVR4]

This makes total sense, the CAS was out of wack when i checked it, so that is a very good possibility. Thanks man ^

 

[MellowVR4]

UPDATE: I took my head off yesterday and found my problem, Two valves where burnt. What could cause this to happen, just from old age? knock? anyway im getting a valve job done to it, hopefully get it runing by the weekend.
Any help on why this happend would be appreciated thanks.

 

[EHmotorsports]

Running lean, incorrect timing, poor quality gas for a good amount of time.

 

[MellowVR4]

might be the incorrect timing, P/O might of been messing with the timing to componsate for the bad idle. /ubbthreads/images/graemlins/dunno.gif

 

[MellowVR4]

Heres a picture of the mess

 

[fuel]

is interesting they both went at the same time! unless one got burnt and the low compression on one cylinder wasn't enough to notice until the other went bad.

 

[MellowVR4]

yea its odd, but pistons looks fine, so hopefully its all good when i put her back together.

 

[MellowVR4]

Does anyone know if the non turbo 4g63 engines came with knock sensor?? I was looking and i dont see one on there. Also dont see a plug on the harness where its supposed to be? i guess it would make sense if it never came with one considering its not a turbo engine, But i can swear that all the 4g's ive seen at a junkyards have it on them? /ubbthreads/images/graemlins/dunno.gif

 

[MellowVR4]

sorry guys, just found the answer to my own question. /ubbthreads/images/graemlins/smile.gif

 

[MellowVR4]

Update: got my head back from the machine shop today. I asked the machine shop guy if he bleed the lifters, and he said he just had them in oil and when he put them back in the head along with the cams and all the other parts, he said that all the valves where open, when he got back to the shop on monday he said that now valves are closed, does this mean i dont have to bleed them? does this mean they bleed them selfs?

 

[prove_it]

I'm not sure, but I've always bled mine before installing. Not worth the risk IMO.

 

[MellowVR4]

me too, but idk if these are good to go, maybe i should just take them out and bleed them /ubbthreads/images/graemlins/dunno.gif

Anyone else have an opinion

 

[EHmotorsports]

I would bleed them.

 

[fuel]

it sounds like they have bled themselves.

 

[MellowVR4]

idk, im just bleed them /ubbthreads/images/graemlins/banghead.gif

 

[MellowVR4]

Got her back together, puurrs like a kitten. 155-153 psi on all four cylinders.

New timing belt
New gernade
New tensioner pulley
New idler
New water pump
New headgasket set
New valve seals
New cam seals
2 New valves
Machined the head
Clean up some old ngk wires
New ngk plugs

 

[prove_it]

At first I was going to ask what manifold that is. Then I saw the intake. LOL

 

[MellowVR4]

Yea no turbo on this one /ubbthreads/images/graemlins/grin.gif

 

[prove_it]

I always wanted to take a 2.4L with the sohc head and swap a dohc head on the block and set it up for e85, use some 1g turbo rods and pistons, and evo cams and drop into a GGSX. Should give it about 12.5-14:1 compression with a 2.4L all motor.

That would be fun.