Question about 1991 Volvo 740

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My 1991 Volvo 740 runs great but if you excellerate too fast it will return to idle and pushing the gas will not do anything. I turn off the key and restart it and it will go again. If I go easy it will get up to 70-80 miles per hour. I have changed the fuel filter and the air flow devise. It didn't help. What can I do now. It must be the fuel pump, I don't think so, or the computer. Help Don Carlos

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Change the EGR valve and you should be good to go............Hope this helps.

Posted on Oct 16, 2010


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My truck turns on, idles fine but when i give it gas it only goes about 3 mph. when i want to excellerate it goes nowhere

Not quite everything is fine.
Is the check engine light on ?
When you push on the gas pedal, does the engine speed change ?
Can you rev up the engine in park ?
What have you checked so far ?

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1 Answer

If I speed up slowly I can go to 70-80 but if I push too much gas it will drop off to idle and I must turn off the key and turn on again and it is good to go

Check your crank sensor. The symptoms you describe indicate a timing error. When you push hard the ECU tries to advance the ignition according to the signals it receives from the the crank position sensor CPS. These signals are either being interrupted or corrupted. Make sure the cps connection is dry, free of dirt and corrosion and that there is continuity in the wires with no obvious breaks or insulation removed. Remove the CPS and check that it is clean and free of body cracks. If problems persist swap the crank sensor out for a new one. These sensors are prone to heat and age.

Oct 16, 2010 | 1991 Volvo 740

1 Answer

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please stop driving you will ruin your motor.the problem you are having is a vacum leak. and that is causing your engine to run very lean.

Mar 11, 2009 | 1991 Volvo 740

1 Answer


try pushing the 4 wires on the radio supression relay into the connector, then try starting it... does it start, run, then die? those connectors ****, i've had the same prob. have you let it huff on some ether? (starting fluid) does it come to life? that would confirm weather or not it its fuel related. my 740 i was loosing voltage to my injectors 10 volts and under, causeing them to inttermittantly not fire, caused by a bad connection at that supression relay.

Feb 13, 2009 | 1991 Volvo 740

2 Answers

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We have the '90 940, have you tried this; when the kids are piling out we reach through the back door and push down the lock button on the drivers door, this locks all the doors without the key...also helps if you have an armful of bags..just make sure your keys aren't still inside!!


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1 Answer

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I suggest you check your fuel pressure and your Mass Air Flow Sensor (MAF). The fuel pumps and the MAF often fail causing these symptoms, but there may be other issues too. I suggest you take it to a qualified mechanic to avoid replacing unnecessary parts, since there are several possible problems.


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