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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

BAD Missfire....

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Old 12-29-2010, 11:34 PM
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Originally Posted by gorge
I had the same problem for 3 months, replaced fuel pump, fuel filter, spark plugs, spark plug wires, injectors, MAF, tuned it, didn't touch the opti, ended up trading the car in and getting a 07 cobalt so I can save some money and star from scratch and do **** the right way
Gotta wait and see how much it is going to cost at the mechanic first...

Hes gonna do a compression test - $90/1hr

Then a Leak down test, if needed- $9/1hr

Plus the tow- $90-$120
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Old 12-29-2010, 11:37 PM
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Run a compression test on that cylinder. That'll give you your answer.
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Old 12-29-2010, 11:38 PM
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Thats a hell of a tow charge.
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Old 12-29-2010, 11:38 PM
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Don't pay him to do that. Rent a tester from autozone for free and do it yourself.
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Old 12-29-2010, 11:51 PM
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Originally Posted by IronOutlaw
Don't pay him to do that. Rent a tester from autozone for free and do it yourself.
no place to work on the car anymore, uncle needs it out of his driveway.

Gotta get it done, its my DD. Dont have time for it to sit.

Do you think it could be the ring?
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Old 12-30-2010, 08:07 AM
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Originally Posted by SpeedFreak123
no place to work on the car anymore, uncle needs it out of his driveway.

Gotta get it done, its my DD. Dont have time for it to sit.

Do you think it could be the ring?
Personally i dont. A "ring" wont cause a misfire like that. sounds like your mechanic is slow at work and needs some cash. This coming from a ex-mechanic
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Old 12-30-2010, 05:01 PM
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Did a compression test on Cylinder 5, 0compression, needle didnt even move a little bit on the gauge.

Did a compression test on Cylinder 1, 0compression, needle didnt even move a little bit on the gauge.

....Tested the gauge with air pump in the shop, needle moved.

Did a compression check on passenger side (dont remember which cylinder), It went to 140ish...

Took off rockers on Cylinder 1 and 5, did a compression check again, and cylinder 1 red 125 on the gauge, and cylinder 5 read 60...

SOOOOOOOOO...... IDK what it is?

Could the rockers have been adjusted wrong? (My buddies/another mechanic thinks so)

Is it a ring?

Warped head?
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Old 12-30-2010, 06:45 PM
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possibly rockers... some people have them tightened so much that the car won't even start
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Old 12-30-2010, 08:04 PM
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If you're getting no compression whatsoever, it's either a broken/bent valve, hanging valve, hole in a piston, or the valve spring itself.

You said the valves were adjusted using the spin method, then backed OFF a half turn, is that right?
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Old 12-30-2010, 08:32 PM
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Originally Posted by RamAir95TA
If you're getting no compression whatsoever, it's either a broken/bent valve, hanging valve, hole in a piston, or the valve spring itself.

You said the valves were adjusted using the spin method, then backed OFF a half turn, is that right?
yeah. I didnt set them personally, so i cant say if he did it right, but thats the method he used....

Could it be the rockers tho?
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Old 12-30-2010, 08:49 PM
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Originally Posted by SpeedFreak123
yeah. I didnt set them personally, so i cant say if he did it right, but thats the method he used....

Could it be the rockers tho?
Doubtful. I would suspect valve springs before anything.
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Old 12-30-2010, 08:54 PM
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Originally Posted by RamAir95TA
Doubtful. I would suspect valve springs before anything.
So I dont have to take my heads off..... yet?

Do i have to buy valve springs as a set?
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Old 12-30-2010, 08:59 PM
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I see you re-set the valve lash on #5 and #1. Springs look good? Valves moving up and down just fine?
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Old 12-30-2010, 09:19 PM
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Originally Posted by RamAir95TA
I see you re-set the valve lash on #5 and #1. Springs look good? Valves moving up and down just fine?
My actual mechanic did it (Not a friend), and he didnt mention anything being wrong with the springs... He kept mentions the head being warped.
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Old 12-30-2010, 09:22 PM
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If you're confident in your mechanical abilities, take off the valve cover and visually inspect the springs/valve stems on #1 and #5.
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Old 12-30-2010, 09:27 PM
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Originally Posted by RamAir95TA
If you're confident in your mechanical abilities, take off the valve cover and visually inspect the springs/valve stems on #1 and #5.
Ill have to go to his shop and do that tomorrow... What happens if theyre fine?
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Old 12-30-2010, 09:58 PM
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Somebody help!!!!!!!!! I DONT WANNA TAKE MY HEADS OF AGAIN!!!
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Old 12-30-2010, 10:35 PM
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I say get the haynes book for lt1s and adjust the rockers yourself, of course following the book step by step, its really easy if you are not running a cam bigger than stock
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Old 12-30-2010, 10:37 PM
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Originally Posted by gorge
I say get the haynes book for lt1s and adjust them yourself, its really easy if you are not running a cam bigger than stock
I have the haynes repair manual.

Do you think the rockers could be the problem?
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Old 12-31-2010, 02:36 PM
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it could be, its not hard to check, and its free
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