Question about 1990 Volvo 740

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1990 volvo 740 turbo hot start fault

I'm hoping that someone can give me some direction with this problem - i have a 1990 volvo 740 turbo with about 290km on it which i have owned now for about 4 months - just recently it has begun to give problems starting when still hot

i tested the coil and sometimes (when hot or cold) it reads high resistance so i replaced this - no change in hot starts

since fuel was getting to the engine i replaced the fuel pressure regulator on the off chance that it might be faulty - no change in hot starts

i tested the battery for standing voltage, charging voltage and a load test and everything appears normal - changed the battery for another that i had in another car - no change in hot starts

checked for spark and it appears to be healthy although there was a slight red/orange tint to it and not the fat blue that it should be

the only thing that appears to work it a jump start after which it runs like a top - any suggestions???

Posted by on

  • shegarty Sep 01, 2008

    think it might now be the impulse relay as changing the MAF did not aleviate the hot start problem - while having my wife turn the car over tapping on the impulse relay with a wrench got her to fire up (the car, not my wife!) heading to the wreckers tomorrow to see if i can pick up another relay

  • shegarty Sep 03, 2008

    turns out it was the impulse relay - at least it seems to be starting hot now, touch wood ;)


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Hi, try fuel pump relay,......

Posted on Sep 01, 2008

  • Tony Rodriguez Sep 01, 2008

    Hi, I hope the relay fix it .......good luck...

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