My 1993 Volvo 940 has been running smoothly however, most recently and suddenly, while going at 30 mph (@ approx, 2000 RPM), I stepped on the gas and the power and RPM dropped... No power for about 2-3 seconds. Just as suddenly, the power came back and the engine ran smoothly. This happened a few times on the way home from work. When I was stopped in traffic, it stalled once but I was able to immediately start the engine which ran smoothly... If I keep the RPM elevated, there is no loss of power... Could this possibly be a clogged fuel filter? I do not think that it is a clogged injector, otherwise the engine would run rough.. The distributor cap and rotor are fine. It appears that it may be intermittent fuel starvation... Any insight would be greatly appreciated... could it be an intermittent fuel pump relay? Has anyone ever experienced similar symptoms?

Thanks,

OnlyVolvo

If it is a normally aspirated car the symptoms are similar to a failing fuelpump (in my experience).

I would reflow the solder on the injection and radio suppression relays to eliminate those items as the cause and see how it goes.

Good luck,
Randy

Hi,

This just recently happened to me. Engine died while stopping at red light. Started right up. Then it died again. Turned off the AC, freed the gear, started right up again. Then it stopped to happen. Checked OBD later came up with 1-1-1. One thing I noticed every time before it dies the lambda-sond warning lights up while RPM dropped before engine dies. Could be fuel starvation. Main fuel pump (Bosch OE) is less than a year old. The in-tank pump is past 10 years old now, last replaced in 2006. That could be it.

Mind you there are very few running issues with no OBD code for the 940. Namely fuel and ignition systems (count in the radio interference relay too). I think for model years up to 1993 the rectangular fuel relay (2 relays in one) is used. Worth checking this also. These beside having low fuel in tank.

I'm still investigating. Mine is 1994 Bosch NA 940.

Regards,
Amarin.

This description of yours matches my experience driving my MIL's '92 Regina-fueled 944 for which this was the root cause:



http://cleanflametrap.com/ReginaFuelPump/
--
Art Benstein near Baltimore

Engineering says: "Major Technological Breakthrough"
Engineers meant: Back to the drawing board.