That sounds like your thermo is stuck... (archive)

Open. May or may not be related to your symptoms, but if your engine will not reach normal operating temp unless you are sitting or in stop and go traffic, it usually indicates that your thermostat has a problem. I think they are about $20US at Zygmunt. With all the temp sensors in the FI control system, you'd need to have the car at its normal operating temp before trying to diagnose this further.

Kevin

I went from 235/??x16s up to 225 & 255/35x19s.
The 19s didn't seem to be that much bigger in diameter.
It was doing it on the motorway, and the engine temp was pretty low too.
Warmed up to normal as soon as I got back into normal traffic.

Without knowing ANY specifics, I'd recommend swapping back to your old wheels and seeing if the problem is still there. Kind of hard to think of why this would be a problem, unless a much greater tire diameter changed the load required to accelerate the car at speed.

Just for curiosity, what size wheel/tire combo was on the car, and what did you go to?

eric
'88 735i 5sp

Well, after 2300 miles of 750 ownership, It's developed its first problem.
While easing off and trying to cruise at 85mph, the engine seems to hesitate. It's almost like the box is trying to shift down.
Any ideas?
This has only happened since I fitted my 19inch alloys.
Steve

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