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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Idle high when rainy. Drops to 1000 when car comes to a stopViews : 1320 Replies : 33Users Viewing This Thread : |
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Jan 18th, 2024, 15:43 | #31 | |
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Feb 1st, 2024, 23:16 | #32 |
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Just on rain issue, It's more rainy in the UK and I have had the bonnet seal fail and drip on the distributor. But this causes severe ignition problems and engine dies when you try to accelerate hard.
Other than that the speedo can work while the vehicle speed signal isn't making it to the fuel ECU. The best way is to read the codes to check this out, but if the idle is dropping when you stop then it's probably OK. You also want to consider an air leak, as this could be the reason for the high idle. It might be worse when it rains if its colder and you are getting more fuel from the cold start program. Last edited by TonyS9; Feb 1st, 2024 at 23:22. |
Feb 2nd, 2024, 06:16 | #33 |
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I had the same scenario as you several years back with my 940. I tried all the usual stuff you have been through. What was really frustrating is that the car drove fine in the dry. I even booked it in with a BOSCH tuning specialist who could find nothing. Obviously it would not do it in a warm dry workshop. I got to thinking about spray from the road whilst driving, so in desperation, on a dry day when it was idling fine up my drive, I got out a garden hose and sprayed underneath the engine. Bingo, it instantly started fluctuating and playing up. I traced the issue back to the wiring on the Lambda sensor in the front part of the exhaust. The wiring was beginning to break down and when water was added into the area shorting out somewhere. Initially the wiring looked fine but I changed the sensor for a new one and that cured that. Never had the problem again.
When I examined the wires closely from the sensors it was just possible to see the insulation starting to breakdown. Its worth a look or even a change of sensor for a new one as I don't believe they are that expensive. Rules out another possibility if nothing else. Good luck. |
Feb 2nd, 2024, 07:12 | #34 | |
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