| Author |
Message |
irfgt
| | Posted on Friday, February 09, 2001 - 5:14 pm: | |
I would suggest removing the catalytic converters and look through them and I will bet that one of them is clogged causing one bank to foul out. |
HEATH
| | Posted on Friday, February 09, 2001 - 10:40 am: | |
84 MONDIAL CAB RUNS ROUGH BELOW 3000 RPMS. DO I NEED TO LOOK FOR A VACUUM LEAK? MOTOR SEEMS TO CUT OUT, NOT HITTING ON ALL CYLINDERS? WARM UP IDLE SPEED WILL SOMETIMES REACH 2100 RPMS BEFORE REDUCING TO 1100. ANY THOUGHTS WOULD BE HELPFUL. |
Dirk
| | Posted on Sunday, January 21, 2001 - 5:38 am: | |
I think really rough running at revs between 2000-3000 rpm is not the right word.
The engine runs "unround" at these revs and it sounds, that not all cylinders
has correct firing. But on the old spark plugs i can see nothing.
If there are only a few cylinders not running correct should You see this on the spark plugs ?
What about the injection system ?
Which problems can be there ?
The head gasket had never changed, maybe this is the reason.
I think it should be CO2 in the cooling system ?
A cracked cylinder head? I have heard, the QV engine doesnt have problems
with cracked cylinder heads. |
Jim
| | Posted on Saturday, January 20, 2001 - 7:30 am: | |
Are you sure that you are using the correct plugs and that they are gapped correctly?
What do the plugs look like when you take them out?
Are your wires OK? |
'75 308 GT4 (Peter)
| | Posted on Saturday, January 20, 2001 - 3:03 am: | |
Are 308's that renowned for failing head gaskets? I've heard the horror stories of breaking belts, but faulty head gaskets? I guess anything is possible and especially with all-alloy motors like this, its possible.
If the head gasket leaks, then the motor should run rough throughout the rev-range (not in the narrow window Dirk describes). That's my theory, is it true? |
Paul
| | Posted on Saturday, January 20, 2001 - 12:12 am: | |
I hope this isn't true, but plugs that get fouled again and again could be due to a faulty head gasket, cracked head or cracked block, letting coolant into the combustion chamber and combustion material into the coolant. One way to check this is to look at your coolant and inspect for contamination like an oily residue. Another symptom is a regular loss of coolant without any sign of a leak... "where is it going?" The answer would be "your engine is trying to burn it in the cylinder". I think coolant getting into the combustion chamber produces a certain color smoke... maybe white.
Is it just one or two plugs (cylinders) that are getting fouled? If every plug is getting fouled exactly the same way, I would then say you have a fuel mixture problem. |
Dirk
| | Posted on Friday, January 19, 2001 - 5:36 am: | |
My 308QV-84 runs sometimes rough between
2000 and 3000 rpms. When i change the spark
plugs everthing is ok. But after 400mls there
is the same effect. Does anybody knows what
can cause this ? |
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