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Hard Start - Very rough, Surging Idle 700

posted by  Stormie on  Mon Mar 29 12:15 CST 2004
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last visit: Mon Nov 4 14:12 CST 2013
[RELATED]

Hi Guys,

My '89 765T (B230FT)is not doing well, my wife's a little peeved - you know the story.

I repaired a intercooler hose leak and restored the performance this weekend. We were driving and all of a sudden, the car almost stalled and began to "buck". We were close to home and made it to the garage, where it's sitting now.

It will start, with difficulty and the idle surges between 500 and 1500rpm. I've checked all hoses, tried unplugging the AMM with no change and gone over the hoses very thoroughly. There is a fairly large gauge wire running from the coil and tapping into a wiring harness along the drivers side, from the PO. I'm wondering if there was a problem with the ECU and something was bypassed(?)

I'm thinking ECU, Idle control motor, fuel pressure regulator as the next to test. Maybe some sensors that may cause these symptoms? Anyone have procedures to verify that these are working? I'd rather not "shotgun" and buy a bunch of parts that I don't need. The other option is to take it to my local Volvo guy (he's excellent), but I'd like to at least have a shot at it.

Any other feedback, experiences and tips are greatly appreciated.

Stormie - '89 765T (247,000 miles) + '88 240DL (448,000 miles)






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