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This one is really driving me nuts. I posted a month ago but much has been done since then and still no solution. The car is a 1984 240 wagon, manual trans with 145K miles. Here is the problem in a nutshell or clamshell or whatever:
Start car hot or cold, drive a few feet in 1st gear and car bucks/hesitates/almost dies throws me into the windshield and then picks up and runs perfectly. This happens only once everytime I start the car and drive for a few feet. From then on, no problems all day long as long as I don’t turn the car off. Car starts instantly hot or cold. Idles great. Acceleration is great. No misses. No other hesitation. But as soon as I turn the car off and let it sit for a few minutes, the problem will reoccur when I restart. A single severe hesitation (just to emphasize, it is not a little miss) and then the car runs beautifully from then on.
The following parts were replaced either new or from a same year problem free, solid running 240 (I have a few others).
- Fuel injection control unit (two different units just to be sure)
- Ignition control unit
- Fuel pressure regulator
- Air mass meter
- Fuel injection wiring harness and ignition control wiring harness
- Air control valve
- Coolant Temp sensor
- Knock sensor
- Main fuel pump and filter
- Tank fuel pump, rubber hose and sock
- Replace and adjust throttle position sensor switch
- Replace distributor, cap and rotor (not plugs or wires)
- Checked timing set to 12 degrees
- Check and clean fuses in #4 and #6 slots
- Replaced both main and fuel pump relays
- Checked all hoses for leaks including accordian AMM, IAC etc.
- Cleaned flame trap
As near as I can tell there is nothing left that can be replaced. In desperation I followed the complete shotgun repair approach.
I also had the car over at a shop and they spent 6 hours trying to figure it out with no luck. They aren’t Volvo specialists but they are a pretty good shop.
At this point, I can only hope to come across someone who has had this identical problem or take it to one of a number of the Volvo specialty shops or the dealer.
Any ideas?
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