454 tbi flooding

[rjn72]

My 87 v3500 developed an exhaust leak, when the weld broke lol. I dropped it off to have the tires balanced and when I picked it up it won't hardly run. It is flooding, bad. It was running a little rich, but it was still running ok. What would make a tbi setup flood like this. A carburetor has a float, but tbi is foreign to me. I have since welded the exhaust up but that has had no effect. I took the injectors apart and cleaned them with no change. Any suggestions are greatly appreciated.

[pig rig]

Id say your o2 censor or your temp censor below your thermostat

I hated tbi engines but once I started to learn what each censor does and how it works their a lot easier to tune

[3r!c84]

id take it back to where you had the tires balanced, and ask them what else they have done to your truck


on a side note...

i work at goodyear and hate customers that come back and complain about somthing we didnt even touch.. haha just saying.

but id still go back and ***** haha

[BigBlocksRule]

Flooding and running rich like that is almost always the intake coolant temp sensor. When it fails, it tells the computer that the coolant is super cold, so the computer repsonds by pouring fuel in to generate heat. It's in the intake near the thermostat. Pick up a replacement and plug it in, just leave it laying on the intake. Should clear up quick if that's the issue. Once you've determined that it is, you can junk the old one and install the new one in the correct spot.

[Long79]

I would say during your welding you put some high voltage/amps through a sensor and toasted it.

[Hulk Will Smash]

Originally Posted by Long79

I would say during your welding you put some high voltage/amps through a sensor and toasted it.

That's something that I always worry about when welding on a vehicle. Is there a good way (short of removing the sensors) to deal with this? Is unhooking the battery sufficient? I know this is a super dumb question and I've never actually had an issue with it, but I figured I'd ask since it came up. I'm not much of an electrial guy.

[rfmaster]

Originally Posted by pig rig

Id say your o2 censor or your temp censor below your thermostat

I hated tbi engines but once I started to learn what each censor does and how it works their a lot easier to tune

Originally Posted by Hulk Will Smash

That's something that I always worry about when welding on a vehicle. Is there a good way (short of removing the sensors) to deal with this? Is unhooking the battery sufficient? I know this is a super dumb question and I've never actually had an issue with it, but I figured I'd ask since it came up. I'm not much of an electrial guy.

rjn72
If your engine can start and runs very rich the chances are that CTS sensor next to thermostat housing is shot or connector is unplugged. CTS has a two pin connector with one yellow wire and one black.

O2 sensor output terminal is isolated from exhaust system, however to prevent ECM damage from welder induced currents unplugging ECM from the harness is sure way to prevent electronics damage. Unfortunately, this was not followed during repair.

//RF

[rjn72]

Thank you very much. coolant temp sensor fixed the problem. Truck is still running a little rich. As I drove it home it did consistently run better though. It may be fixing itself. What do you guys think?