No start

[Karlwithak]

I have a 92 Ford Explorer 4.0 . I have fuel pressure and I have Spark. But the vehicle will not start unless I spray brake clean down the throttlebody . Any ideas would be greatly appreciated

 

[natenkiki2004]

Does it stay running if you start it with brake cleaner? Does it start if you feather the throttle while cranking? If so, it's probably the ECT and/or IAT sensors.

If it only runs on brake cleaner... unplug the coil pack and hook up a test light or noid light to the injectors to verify injector pulse.

 

[Karlwithak]

Yes it stays running if I keep spraying brake clean. I've already tested the injectors with a noid light and they are firing. I've checked the eec relay and fuel pump relay too. I have spark also

 

[Karlwithak]

Yes it stays running if I keep spraying brake clean. I've already tested the injectors with a noid light and they are firing. I've checked the eec relay and fuel pump relay too. I have spark also

 

[natenkiki2004]

But it dies once you let off the brake cleaner? Did you put the noid light on both banks? Did this vehicle sit for a long period of time? It would be odd for all the injectors to stick, you only need a few to keep the engine going.

 

[Karlwithak]

I think the injectors are working somewhat because I had it running for a while with only sprain a little bit of a break clean keep it running . Next step is going to be pulling the injectors to see what their spray looks like . I had a running for about 10 minutes and only use about three quarters of a can of brake Clean

 

[2stroke]

If the truck has been sitting for a while, I think clogged injectors are very possible. Ethanol gas turns to gunk in no time. All you have to do is pull the injectors and flush them (forward and back). I use a syringe with a hose, and while they normally get 12 volts, a 9v battery should actuate them. It worked for me.