Myles Cyncora Posted August 17, 2020 Share Posted August 17, 2020 Hello everyone. I picked up 2 Manches over this past winter to make one running truck. I swapped the steering column and the Throttle Position Sensor from the parts truck to the good truck and got it running, that was a few weekends ago. this weekend put a good battery in that truck and it cranks but won't start. It will run if gas is poured into the throttle through a bottle but as soon as the bottle is taken away the truck dies. There is fuel coming out the injectors. I'm so lost now. Any help will be greatly appreciated. Link to comment Share on other sites More sharing options...
eaglescout526 Posted August 17, 2020 Share Posted August 17, 2020 You say 89 2.5L, it would be Throttle Body Injection. Have you confirmed that the injector is pulsing along with its circuit? Has the fuel pump been heard during priming sequence and has the pump been replaced or checked? Link to comment Share on other sites More sharing options...
Myles Cyncora Posted August 17, 2020 Author Share Posted August 17, 2020 Yes the fuel pump can be heard priming and yes the injector is pulsing. Link to comment Share on other sites More sharing options...
eaglescout526 Posted August 17, 2020 Share Posted August 17, 2020 This will be a fun one. We had another member, @SoCalManche, his wouldnt fire at all on its own without gas. Did rigorous testing on sensors, wires, ECU and the fuel pump circuit to confirm everything and it turned out to be a bad injector. One of the things we did to quickly confirm that there was fuel actually getting to the throttle body was to remove the injector and see if fuel would dump into the bowl or not. There is am Ωhm test that can be done on the injector and I think if its over 10Ωhms, its bad but sometimes a bad injector will still show good like in SoCals case. Link to comment Share on other sites More sharing options...
SoCalManche Posted August 17, 2020 Share Posted August 17, 2020 7 minutes ago, eaglescout526 said: This will be a fun one. We had another member, @SoCalManche, his wouldnt fire at all on its own without gas. Did rigorous testing on sensors, wires, ECU and the fuel pump circuit to confirm everything and it turned out to be a bad injector. One of the things we did to quickly confirm that there was fuel actually getting to the throttle body was to remove the injector and see if fuel would dump into the bowl or not. There is am Ωhm test that can be done on the injector and I think if its over 10Ωhms, its bad but sometimes a bad injector will still show good like in SoCals case. Well, it was also simultaneous plagued with a fuel pump relay issue that magically fixed itself; I'm assuming it was because of the C100 cleaning. Link to comment Share on other sites More sharing options...
Myles Cyncora Posted August 17, 2020 Author Share Posted August 17, 2020 How do I perform the test on the injector? And how do remove the injector if it is bad? Link to comment Share on other sites More sharing options...
eaglescout526 Posted August 17, 2020 Share Posted August 17, 2020 Theres a noid light kit you can get at your auto store to test the wiring and ECU. The injector is Ωhm tested with a voltmeter. If you remove the throttle body bonnet it will reveal the injector, there are two screws holding the injector retainer in place, remove those and the injector will pull straight out. CAUTION. When reinstalling the injector, do not overtighten the screws, they can break and are not replaceable. Link to comment Share on other sites More sharing options...
Eagle Posted August 17, 2020 Share Posted August 17, 2020 13 hours ago, Myles Cyncora said: Hello everyone. I picked up 2 Manches over this past winter to make one running truck. I swapped the steering column and the Throttle Position Sensor from the parts truck to the good truck and got it running, that was a few weekends ago. this weekend put a good battery in that truck and it cranks but won't start. It will run if gas is poured into the throttle through a bottle but as soon as the bottle is taken away the truck dies. There is fuel coming out the injectors. I'm so lost now. Any help will be greatly appreciated. The basic requirements for an internal combustion engine are fuel, air, and spark. If it runs when you pour gas into the throttle body, you obviously have air and spark, so your problem is fuel delivery. If the injector (single -- there's only one injector on a 1989 2.5L) is squirting gas, there are a couple of possibilities: 1. Not enough gas 2. Too much has 3. The gas has been in the tank tto long and it's stale. Link to comment Share on other sites More sharing options...
87MJTIM Posted August 17, 2020 Share Posted August 17, 2020 2 hours ago, Eagle said: The basic requirements for an internal combustion engine are fuel, air, and spark. If it runs when you pour gas into the throttle body, you obviously have air and spark, so your problem is fuel delivery. If the injector (single -- there's only one injector on a 1989 2.5L) is squirting gas, there are a couple of possibilities: 1. Not enough gas 2. Too much has 3. The gas has been in the tank tto long and it's stale. And compression! Link to comment Share on other sites More sharing options...
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