A1aardvark
New Member
- Joined
- Dec 7, 2013
- Messages
- 11
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Hiya
Just got my 8o 4.5 auto out for first real run on Sunday since I purchased it a month ago. 6 hour drive with about 2.5 hours in low range and it didn't miss a beat. I took it down the shops Tuesday and alls still good but Wednesday morning I went to move it a few meters and it started idling extremely rough and nearly dying. Contacted previous owner and he admitted that it had done this before and had his mechanic go searching. His mechanic couldn't find a cause but cleared up on its own so he stopped worrying about it. Drove it today trying to find a pattern and but it seems very random.
Here's the symptoms
Starts fine but idle gets rougher and rougher and in about a minute it nearly stalls
Rev it a bit and it may just about go back to normal or may not
Doesn't matter if it's hot or cold
When it's doing it the car drives sluggishly in lower and middle rev range but seems fine in upper revs
May clear up for a while randomly
Also I havent done any water crossings since I purchased but have been down a few bumpy roads. Previous owner never did dirt.
So far I've checked the condition of tubes and intake for vacuum leaks. Also tugged and pushed on wires and vacuum tubes randomly while the engine was running. I also had the the compression of the cylinders check when I bought it and and it was even across all six.
I've done lots of googling and problem is people seem to described similar problems very deferentially. So far it seems the candidates are vacuum leaks, O2 sensor, MAF sensor, sensor wiring/plugs and coil/leads. Also read one post about fouled exhaust valves giving similar symptoms.
Given the random nature of the problem does it seem like any of these are most likely???
Just got my 8o 4.5 auto out for first real run on Sunday since I purchased it a month ago. 6 hour drive with about 2.5 hours in low range and it didn't miss a beat. I took it down the shops Tuesday and alls still good but Wednesday morning I went to move it a few meters and it started idling extremely rough and nearly dying. Contacted previous owner and he admitted that it had done this before and had his mechanic go searching. His mechanic couldn't find a cause but cleared up on its own so he stopped worrying about it. Drove it today trying to find a pattern and but it seems very random.
Here's the symptoms
Starts fine but idle gets rougher and rougher and in about a minute it nearly stalls
Rev it a bit and it may just about go back to normal or may not
Doesn't matter if it's hot or cold
When it's doing it the car drives sluggishly in lower and middle rev range but seems fine in upper revs
May clear up for a while randomly
Also I havent done any water crossings since I purchased but have been down a few bumpy roads. Previous owner never did dirt.
So far I've checked the condition of tubes and intake for vacuum leaks. Also tugged and pushed on wires and vacuum tubes randomly while the engine was running. I also had the the compression of the cylinders check when I bought it and and it was even across all six.
I've done lots of googling and problem is people seem to described similar problems very deferentially. So far it seems the candidates are vacuum leaks, O2 sensor, MAF sensor, sensor wiring/plugs and coil/leads. Also read one post about fouled exhaust valves giving similar symptoms.
Given the random nature of the problem does it seem like any of these are most likely???