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|3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.|
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Oh, one thing in regard to my original problem. My temp gauge problem was also associated with a progressing idle/rough running problem. It was my intake gasket all along. Why a bad intake gasket causing me huge idle - hesitation problems would cause my temp gauge to bounce and peg with 2 mins of warming up is totally beyond me. If anyone can answer the riddle please sound off because I am baffled by that.
I like my temp gauge to be rock steady. Toward that end, recently I swapped the dual temp (91/99 C) sender, and put in a replacement fan clutch. Went on a nice highway run at speeds from 60 to 85, and saw the temp gauge be anywhere from the 1/4 to 5/8 mark, but mostly a little left of center.
I know some other solutions involve getting into the instrument cluster to cure a bouncing temp switch, but I like bleeding the system as a first step.
On my m42 engine, my temp gauge bounces around in the hot and after just a few minutes it pegs to the hot side. The engine is not overheating. When it pegs hot, the engine runs poorly with bad hesitation until I give full gas then it picks up. It did this to a minor degree for a while, then the gauge returned to normal, the engine temp was fine, and it never ran poorly. Then after about 3 weeks, the problem came back only much worse. After running the car for 5 mins the gauge pegs to hot and the car hesitates from the moment I crank it up even dying on idle occasionally. The hesitation was perfectly concurrent with the gauge freaking out. I have replaced the single wire temp sender unit in the middle of the block but not the one near the front with 2 wires. I'd rather not replace any more good sensors to troubleshoot. What next?
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