2G no start after head change?

[kenuwine4g63]

Ok guy i searched and searched and cannot find/figure out the problem. I came to the conclusion that i have no spark..AT ALL..I just put another head on the car due to my last one bending valves. I have compression but no spark. I have a volt tester that messures all resistance and voltage..When i look at how to test the coil pack primary resistance do i suppose to test it at the plug or the connecter itself..the secondary is reading 13.13, and 13.5 so the coil pack is good?? But when i do the primary i get readings like .1 to .5...Where should i have my meters turned to. I know the horseshoe sign is for resistance, but it gives me values(20m, 2m, 200k, 20k, 2k, 200) which one do i turn the nob to..I also unpluged the transitor and tried starting the car and it makes the same exact sound as if i had it plug up..I switch transistors and still no spark..I need help havnt driven my car in 3 months and its my DD.

 

[kenuwine4g63]

No..... Zero compression on #4... High 140s on the other 3.

the car is cold tho right. you have to get the car at operating temerature before doing a compression test. The car will still run with one dead cylinder. It'll just run like crap....or at least it should

 

[Maverick4g63]

I hope its not a stuck compression ring.

Everything under the valve cover looks fine. I dried the plugs and reinstalled them.

 

[kenuwine4g63]

I hope its not a stuck compression ring.

Do a wet compression test..drop about a teaspoon of oil in that cylinder and test it again it should def go up...My test was horrible too, but my car was cold, im going to make sure my ARPs are tighten down to spec again, because im surprised

 

[Maverick4g63]

Well if the oil sits in the dish of the piston that would produce a false increase in compression. Right?

Im using the 4123 firing order.

 

[kenuwine4g63]

Well if the oil sits in the dish of the piston that would produce a false increase in compression. Right?

Im using the 4123 firing order.

It will let you know if you have a piston problem or not, could be piston rings, could be a stuck valve....But i would try it just to see how much it goes up by

 

[Maverick4g63]

Got it running by swapping the firing order around. Still sounds like a dead cylinder though.

Number 4 is still without compression. This does not look good at all.

 

[kenuwine4g63]

Got it running by swapping the firing order around. Still sounds like a dead cylinder though.

Number 4 is still without compression. This does not look good at all.

Is it runing real choppy..or hesitant

 

[Maverick4g63]

Umm... Choppy? Its a bit hard to describe with words. I have zero compression on 4 and the oil didnt help at all. If a valve was stuck open wouldnt the piston smash it closed?

 

[Maverick4g63]

Officially stumped.

 

[kenuwine4g63]

Officially stumped.

Take the valve cover off, and make sure all your rocker arms are in place. Wriggle them if they move alot side to side then u usually have a bent valve...hopefully thats not the case, if a piston hits one it'll bend it causing no compression. Before you put the motor in the car did you bleed the lifters/lashadjusters in the head? If not the lifters are built up with oil, so when you put the cam shaft back on the valves hang out a bit when they are suppose to be closed and that def can cause some bent valves....

 

[Maverick4g63]

This is a fresh rebuilt and assembled long block so the lifters should have been bled.

Update: I haved ruled out a broken ring and leaning towards a stubborn lifter. I plan to let it run for awhile after work and hope that the lifter will fully prime.

 

[kenuwine4g63]

This is a fresh rebuilt and assembled long block so the lifters should have been bled.

Update: I haved ruled out a broken ring and leaning towards a stubborn lifter. I plan to let it run for awhile after work and hope that the lifter will fully prime.

Push down on them and see if they are able to move...

 

[Maverick4g63]

I will as soon as I get home. Im stuck here at work until 4... In the meantime I spoke to the mechanic that assembled my motor. He confirmed that all cylinders had compression when it was at the shop. This has to be a lifter issue. I was thinking about leaving early, but then I remembered that this car is bleeding me dry.

 

[kenuwine4g63]

I will as soon as I get home. Im stuck here at work until 4... In the meantime I spoke to the mechanic that assembled my motor. He confirmed that all cylinders had compression when it was at the shop. This has to be a lifter issue. I was thinking about leaving early, but then I remembered that this car is bleeding me dry.

. i dont blame ya man, i go into work late somtimes to finish on my car..Im sitting on a goose egg now because of it

 

[Maverick4g63]

Hopefully it came from a golden goose.

 

[Maverick4g63]

None of the lifters are spongy. I have let the car idle for about 5 minutes with no change. Still no compression on #4.

Update: reverse leakdown confirms that the exhaust valves aren't sealing.

 

[kenuwine4g63]

None of the lifters are spongy. I have let the car idle for about 5 minutes with no change. Still no compression on #4.

Update: reverse leakdown confirms that the exhaust valves aren't sealing.

hmmm and how did you do that leak down test

 

[Maverick4g63]

Injecting air into the cylinder using only the hose attachment from my compression test kit and a compressor. Air was passing past the exhaust valves while they were in the closed position. Just make sure the lifter is on the base circle of the cam.

 

[kenuwine4g63]

Injecting air into the cylinder using only the hose attachment from my compression test kit and a compressor. Air was passing past the exhaust valves while they were in the closed position. Just make sure the lifter is on the base circle of the cam.

I bet you may need to bleed those exhaust lifters...my head was like that at one point, where all my valves were closed when the camshaft wasnt installed..then as soon as i installed them all my valves opened up....Then they got smash by the cruel pistons i have..Either that or they are bent, or whoever built the head didnt seat the valves right..

 

[Maverick4g63]

I have pretty much given up on the lifter issues. I will pull the head when I get home.

 

[kenuwine4g63]

I have pretty much given up on the lifter issues. I will pull the head when I get home.

Jesus man....I pulled my head 4 or 5 times in about two weeks with hand tools...It has taken a toll on my body. Do it right once and be done with it, i learned the hard way..But i am so good at the point where i can do it in about 25-30 mins, and install it with the timing belt in about a hours time..with hand tools

 

[Maverick4g63]

Sounds like you kept missing something. Im gonna pull my head and ship it off to its shop of origin. Im lucky that im dealing with a straight up guy because this could have been a bad situation. He is paying all shipping, repairing the head, and sending it all back with new gaskets. Looks like another couple of weeks before I get to enjoy my first dsm.

 

[kenuwine4g63]

Sounds like you kept missing something. Im gonna pull my head and ship it off to its shop of origin. Im lucky that im dealing with a straight up guy because this could have been a bad situation. He is paying all shipping, repairing the head, and sending it all back with new gaskets. Looks like another couple of weeks before I get to enjoy my first dsm.

I know the feeling....Hopefully mine is just a few days away..HOPEFULLY, and yea that guy seems real cool for that especially at no extra cost for you

 

[Maverick4g63]

Pulled the head last night. It seems that the exhaust valve on # 4 had several thousandths clearance, even during its closed state. Its odd that it only had this clearance on one side of the valve.

 

[kenuwine4g63]

Pulled the head last night. It seems that the exhaust valve on # 4 had several thousandths clearance, even during its closed state. Its odd that it only had this clearance on one side of the valve.

shouldve bled that lifter that rocker arm sits on, reinstall the cam turn it to where that valve is closed and see if it wouldve met the head closer