[stanley24538]

I recently bought an 85 volvo with a 2.3l engine and up until last week It ran great. Now it starts and idles great but as soon as you press the gas it stalls. I have checked both fuel pumps and replaced the filter, but still having the same problem. It is getting fuel to the intake, But I cant figure out the problem. Any help would be great.

 

[sulley007]

Which model volvo do you have and where are you located?

 

[stanley24538]

240 gl and I am In Virginia

 

[sulley007]

1. 2 series cars of this vintage had engine wiring harness that self distructed [the insulation would sluff off the wiring and cause intermittant shorts and opens] the most common places for this to happen are where the ignition / alternator harness passes under the oil pan at the front of the motor. at the coolant temp sensor [center of engine below the intake] and where harness leaves the engine and runs along the firewall.
2. in addition to fuse panal corrosion problems at left kick panal there is a fuse holder near the battery that corrodes and causes problems [this should be replaced with a marine type sealed fuse holder and is to be soldiered in place and heat shrink insulate the joints] this should be done on all 2 series cars.
3. the fuel pump relay is located under glove box area [most likely the fuel pumps have been replaced by now] but the relay is rarely thought about [it may have been overloaded by old pumps and not replaced when new were fitted]
4. of course other answers for throttle body and constant idle motor cleaning still apply and a qiuck tast for the air mass unit is to unplug it [it wont run very good , but if is an improvement in overall performance is a clear indication of it being bad] [[this forces computor into a preprogrammed limp home mode]
5. one last thought there was a computer update for a stalling condition years ago that affected a very narrow range of cars. not all cars recieved the update. and the troubles didn't show up until high milages. soo remove the right kick panal and record the number off of the computer and call your local dealer to see if yous is within that range of updated numbers
[i have only seen one period] good luck i hope this is of some help to you [also if you do have a harness problem go to ipd usa.com. for new replacement harness]

 

[stanley24538]

I did find 4 wires that the insulation was melted off of. A green/white wire that went to the temp sensor, and a green and yellow that went to the starter. I replaced both of those, but there is a red and a black wire that I traced around to the front of the oil pan, but couldnt find wher they went to form there, Do you know where they go.