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Old 09-30-2013, 01:02 AM
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faulty cylinders

car running poorly. set timing. car still backfirers sometimes.
sparyed water on headers and number 2 and 8 pipes stayed wet way longer than the rest of the pipes. can you guys tell me whats going on with my valve train. will preform compression check next.

thanks in advance

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Old 09-30-2013, 05:14 AM
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1st thing to ck would be to ck if those 2 cylinders are firing or not.Pull the plug wires on suspect cylinders with engine idling.With the limited info provided,it could be 1 of 100 different causes,but'that would be a good start.If they aren't firing,start with the plugs & wires to determine the reason why.Do the simple stuff 1st.
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Old 09-30-2013, 09:39 AM
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The water test(spit) tells you the plugs are missing.no heat,no fire,,,check wire to header clearance after replacing the plugs(not cleaning,,,replacing)
look at the plugs that come out,,,oil fouled,gas fouled?
make sure wire boots fit tightly,plug is properly gapped (.035)
what ignition system are you using?
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Old 09-30-2013, 12:36 PM
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hi , I figured ill share my 2 cents.... first make sure #1 cyl is at top dead center, if it is, then try to drop in the distributor in at 10 deg before top dead center. that's just the basic timing, after that hook up a vac gauge, and tune the timing and carburetor, after dropping in the distributor, hook vac gauge tune your carb. goal is to get the highest vac a good running engine would have about 18-20 in of vac.. once you have the highest reading when adjusting carb then move on to the ignition timing,, remove the vac hose and move the distributor until the vac increases,, your goal again is 20-22 vac... hope this helps
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Old 09-30-2013, 02:03 PM
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ok,,,,

Quote:
Originally Posted by 81camaro1 View Post
hi , I figured ill share my 2 cents.... first make sure #1 cyl is at top dead center, if it is, then try to drop in the distributor in at 10 deg before top dead center. that's just the basic timing, after that hook up a vac gauge, and tune the timing and carburetor, after dropping in the distributor, hook vac gauge tune your carb. goal is to get the highest vac a good running engine would have about 18-20 in of vac.. once you have the highest reading when adjusting carb then move on to the ignition timing,, remove the vac hose and move the distributor until the vac increases,, your goal again is 20-22 vac... hope this helps
first,its hard to say what the vacuum should be without cam specs.The temperatures should be similar in all cylinders unless you have a fouled plug or vacuum leak etc.
The popping under load could be a wet plug and of course valve and or cam issues. check the obvious first by pulling all the plugs and replacing all of them if any concerns or replace fouled plugs if the others are like new.check gaps and make sure ignition is working properly.
no need to pull the distributor yet!
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Old 09-30-2013, 02:08 PM
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Quote:
Originally Posted by vinniekq2 View Post
first,its hard to say what the vacuum should be without cam specs.The temperatures should be similar in all cylinders unless you have a fouled plug or vacuum leak etc.
The popping under load could be a wet plug and of course valve and or cam issues. check the obvious first by pulling all the plugs and replacing all of them if any concerns or replace fouled plugs if the others are like new.check gaps and make sure ignition is working properly.
no need to pull the distributor yet!
good point pull the plug out and read what the cylinder is doing,,,
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Old 09-30-2013, 02:10 PM
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For some reason, I always think the worst. Cam is going flat.
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Old 09-30-2013, 04:36 PM
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Quote:
Originally Posted by quick 54 View Post
car running poorly. set timing. car still backfirers sometimes.
sparyed water on headers and number 2 and 8 pipes stayed wet way longer than the rest of the pipes. can you guys tell me whats going on with my valve train. will preform compression check next.

thanks in advance
First thing to check is if those 2 cylinders are getting spark. if not check wires etc. If so verify firing order.
Check compression (if they are low check valve adjustment)
Check for fuel in the 2 dead cylinders.
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Old 09-30-2013, 06:11 PM
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Quote:
Originally Posted by techinspector1 View Post
For some reason, I always think the worst. Cam is going flat.
My thoughts exactly.
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Old 09-30-2013, 07:47 PM
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Might not be a bad idea to check plug leads are on the correct plugs?
Wouldn't be tthe first time it's happened, either swapped at distributor or just plugged on wrong by 'friend helping out'
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