Need Help reading Valves
Thread Starter
Intermediate
Joined: May 2006
Posts: 49
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Need Help reading Valves
I am working on my sons 1997 Pontiac Grand- Am 3.1 L, The symptom was The engine rocked like cracz from side to side at idle it did smooth out at higher rpm but a miss was still notice. No back-fire, no smoke, and no engine codes. I took a reading 1 piston read 30 lbs and the other 5 read 150.
I spent almost 6 hours removing the head "what a horror story trying to work on these dam engines is simply a horror, give me a 350 any day.
In looking at the the small valves in head with the poor reading they are coloured as follows
0ne is almost white, one is a light tan and one is a light black and all the large valves are black
The piston that I read the 30 lbs was the one with the almost white valve. Any suggestions
I spent almost 6 hours removing the head "what a horror story trying to work on these dam engines is simply a horror, give me a 350 any day.
In looking at the the small valves in head with the poor reading they are coloured as follows
0ne is almost white, one is a light tan and one is a light black and all the large valves are black
The piston that I read the 30 lbs was the one with the almost white valve. Any suggestions
Le Mans Master
Joined: Jul 2005
Posts: 5,752
Likes: 4
From: Austin Texas
Have the head checked for a bent/burned exhaust valve (the white one). They should have all looked the same, giving it is fuel injected. If a burned valve, look for the cause before you run it too much. How did the head gasket look? Too late now, but IMO you should have done a leak-down test first to isolate valve/ring failure.
Thread Starter
Intermediate
Joined: May 2006
Posts: 49
Likes: 0
Originally Posted by big_G
Have the head checked for a bent/burned exhaust valve (the white one). They should have all looked the same, giving it is fuel injected. If a burned valve, look for the cause before you run it too much. How did the head gasket look? Too late now, but IMO you should have done a leak-down test first to isolate valve/ring failure.
