...least that is how it acts.
Spoke to Ken at ipd yesterday and explained my problem. It seems to be a fuel delivery issue and not ignition, since tach needle does not drop at any time.
This happened prior to replacing both fuel pumps and still continues. When driving (4 spd w/ OD) between 2000 and 3000 rpms, car jerks. Violently sometimes to the extent that my body is rocking back an forth in my seat and mopeders are passing me on the highway, laughing at me. Sometimes it backfires. This happens no matter how full the tank is. Sometimes the car stalls altogether, and I just restart while coasting down the road. Any suggestions?
Could it be the fuel relay? If fuel relay is bad, wouldn't the car stop working altogether? In a prior note on brickboard, if soldering points are cracked, can the current still jump across, still enabling the relay to work sporaticlly?
Could it be the fuel injector seals? I read another message about a fuse near the power steering pump? What is that? And Ken also said to look at the fuse that leads from the narrow red wire that comes from the battery to the firewall.
Anyone have or had the same problems? Tired of taking it to the volvo guy and paying $80 for computer diagnosis, and them not able to determine what is wrong.
Time for a new/used ECU?
Thanks

Had the exact same problem once, with exact same car ('84 245), and the culprit ended up being the fuel pump relay.

Spent a lot of time scratching my head over that one, and a couple of so-called "mechanics" weren't able to figure it out after replacing most of the fuel system. I finally broke down and resoldered the FP relay (which they told me they had replaced), and all was well again. ;-)

Lot of replies regarding replacing/resoldering relay and checking/cleaning the spade fuse. Thanks all. Will give it a shot. Car has 190k on it, so I fiigure some of these things have to go out at some point, right?

Replace the fuel pump relay. Ihadthe exact problem in a 1982 240 that drove me crazy till it went out altogether. there was loose parts in the relay that would vibrate and break the connection at certain RPM,s and sometimes when hitting bumps. Good luck. Tim

You said that it back fires. Sounds like the fuel may be loading up and not combusting. Just a shot in the dark but have you checked your plug wires? And have you done or had any other work performed.
Later
Joe

New plugs, now iginition coil, new rotor and dist cap and new lead wire that goes from coilto dist.

This sounds simple, but did you replace the fuel filters when replacing the pump?

There is more than one fuel filter? I replaced the Bosch last fall, the one next to the main fuel pump, driver's side.

Hi Drew:

The fuse "next to the power steering pump" and the fuse "in the thin red wire from the battery" are one and the same. There is a 25 Amp spade fuse in the red wire line which powers the fuel injection system. Check to be sure that the contacts are clean, the holder and connectors in good shape etc.

I would pick-up a spare fuel pump relay. These are not that expensive, you can rule it out as the cause of the problem and you should have one on hand in the glove compartment for a spare anyway. The relay could cause this problem but I would expect it would cause problems at different RPM's not always around 2000 or 3000.

I don't understand why the tack does not show a change in RPM. It should show a change whether the stalling is caused by fuel starvation or the ignition cutting out.

Could the overdrive be cutting in and out? Just a thought.

Hope this helps.

Jerry Judg