my car displayed some wierd symptoms today-while i was driving along and then when ii took my foot off the gas pedal-the car started jerking or missing as if it was going to stall but luckily it did not--any ideas as to what is causing this??-or can someone point me in the direction of where a possible answer lies or maybe someone has experienced this-please help.

Possibly the Fuel Pump Relay going out.

Brian16V

thanks brian for your reply.
did you have a similar problem?
today, the car has been fine-no jerking or missing.

In my opinion, definitely not the fuel pump relay. This relay will only stop the fuel pump from running if it fails. When off the throttle and above around 1500rpm, no fuel is delivered to the engine anyway (no point if engine is not being needed to produce power), the engine is just turned round by the turning of the wheels. So if you are experiencing problems in these conditions, it's unlikely to be fuel-pressure related.


The fuel pump relays *can* fail in these (mine did), and the symptoms were, sometimes the fuel pump would not run when you switched the ignition on (should buzz from rear for 1-2 seconds, and continually when running), and the result was the car had no fuel pressure and wouldn't start. New relay = £75, I just opened mine and soldered a broken joint. No problems since.
The relay never suddenly switched the pump off while driving in my case, and would be unlikely to cause the jerking you described.

Is/was the car fine when 'on' the gas?


later!

__________________
190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg

thanks pentoman for your reply.
the car was fine while the foot was on the accelerator pedal.
the car is now running ok.
the car had been sitting for 3 weeks while i was on hols.
perhaps, it was water in the fuel or some electrical problem which has since resolved itself.