Hey all,My first post here so here goes.
I have a 91 240 coupe with an sr. The sr ran perfect until i pulled it to paint the bay. Now it does not start when hot. Any help will be very much appreciated.
Issue:Cold start is fineAfter 20-30 mins Idle it wont startChecked for spark and no spark (At time of problem)Checked for grounds and all seem fineChecked ECU for proper connectionBefore i pulled sr the temp gauge worked, now it does notCar cools for 4-5 hours, starts fine
SOS!!!
Wont start when hot
Re: Wont start when hot (sick240)
looking at a wiring diagram for your engine....
zerothread/251576
the temp sender and the crank angle sensor wiring are just a few pins apart on the connector for the ECU.
First I would look for bent or pushed-in pins on the ECU connector.
Next I would look at the electrical components that either get the hottest or have to work the hardest: this would be the ignition coil, the power transistor, and the crank angle sensor.
When hot, cracked solder connections open up, and cracked insulation opens up. Maybe the jarring of dropping the engine back in cracked something. To help to spot thermally-faulty components, a can of freeze-spray is very useful. You basically cool the part down to about -50F and keep spraying it to keep it cool.
I wouldn't rule out cracked solder connections on the ECU itself, either....
The temp sender not working tells me it's at the ECU connector or something related to the ground side of things...
I could be totally, completely wrong.........
zerothread/251576
the temp sender and the crank angle sensor wiring are just a few pins apart on the connector for the ECU.
First I would look for bent or pushed-in pins on the ECU connector.
Next I would look at the electrical components that either get the hottest or have to work the hardest: this would be the ignition coil, the power transistor, and the crank angle sensor.
When hot, cracked solder connections open up, and cracked insulation opens up. Maybe the jarring of dropping the engine back in cracked something. To help to spot thermally-faulty components, a can of freeze-spray is very useful. You basically cool the part down to about -50F and keep spraying it to keep it cool.
I wouldn't rule out cracked solder connections on the ECU itself, either....
The temp sender not working tells me it's at the ECU connector or something related to the ground side of things...
I could be totally, completely wrong.........
Re: Wont start when hot (sick240)
I too have the same problem but when I pulled the plugs it is flooded to all hell If I give it throttle alittle it starts eventualy I it only does it when hot but if it sits like an hour it usualy starts right up my best guess is the injector has a leek or bad o ring and its getting too much fuel. Im still working on the problem so I let you know