TBI Problems. too much gas

[k5zombie666]

1987 k5 it wont start. It seems like the injectors are throwing way to much gas into the engine. I noticed before it died it was wasting alot of gas. One morning i turn it on and it had really high idle then it choked and never wanted to turn on again.

 

[GalDemSuga]

Check for leaking EGR valve, or another leak on the intake. I had similar issue before. Pull the air cleaner and run the truck it will give you a visual of the injectors spray pattern.

1987 k5 it wont start. It seems like the injectors are throwing way to much gas into the engine. I noticed before it died it was wasting alot of gas. One morning i turn it on and it had really high idle then it choked and never wanted to turn on again.

 

[Fordum]

Sounds like the fuel pressure regulator, or dirty injectors.

Get someone to turn the key on a few times without cranking it and watch the injectors to see if gas is dripping out of them.
If so, then they are not sealing.
But, it sounds like the pressure regulator is stuck closed and letting full pressure get to the injectors.

Never done one myself, but lots of folks here have done a rebuild of both injectors and regulator.
Kit is fairly cheap, I understand.

 

[GalDemSuga]

The TBI rebuild kit is fairly cheap. Advanceautoparts carries it: part # 10902, I think. Its complete with new diaphram etc.

see linky: http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_TBI-Kit-BWD_5115809-P_2355_R%7CGRPFUELAMS_1733508166___

Sounds like the fuel pressure regulator, or dirty injectors.

Get someone to turn the key on a few times without cranking it and watch the injectors to see if gas is dripping out of them.
If so, then they are not sealing.
But, it sounds like the pressure regulator is stuck closed and letting full pressure get to the injectors.

Never done one myself, but lots of folks here have done a rebuild of both injectors and regulator.
Kit is fairly cheap, I understand.

 

[zombie1969]

Coolant temp sensor located on the intake malfunction will cause this.Been there done that yada yada.

 

[British Slave]

If you rebuild the throttle body, I suggest sending the injectors to Witch Hunter Performance. They will check, clean, and flow test. Takes about a week to send them and get them back.

http://www.witchhunter.com/

 

[Keitha]

Coolant temp sensor located on the intake malfunction will cause this.Been there done that yada yada.

This very well could be the cause. It is easy to test, just measure the output of the CTS and compare to the spec.

 

[k5zombie666]

When changing the regulator is there any adjusting or tuning involved?

 

[BoondocK5]

I had a case once where an insect, I think a mud dauber wasp died the return fuel line I left exposed for a couple of weeks. Unbeknown-st to me, I put it together and for the life of me couldn't figure out why it would be dumping so much fuel into the Throttle body.

I removed the return line to find the dead insect clogging the line. removed it with a small screwdriver, and all was good after that.

 

[British Slave]

When changing the regulator is there any adjusting or tuning involved?

Not unless you want to make it adjustable.

 

[TexasSilhouette]

I can't imagine your fuel pressure regulator (nothing more than a diaphram) suddenly one day deciding it won't open.

I suspect if fuel pressure is in fact a problem (has NOT been determined) that it is more likely caused by a blockage in a return line.

Blindly replacing parts and tearing into things gets expensive fast. Testing fuel pressure and sensors is not difficult.

If the engine is flooded, holding the throttle to the floor should put the ECM in clear flood mode and allow the engine to start at least for a moment or two. THis of course assumes your engine is in fact flooded. In a worst case you can unplug the injectors and crank with throttle floored and clear it out.

As mentioned, test coolant temp sensor, test/check EGR, test/check fuel pressure.