Urgent Motor Help Needed After Tuneup

[Nick88]

WHAT is "140"?

140F temperature?
140 fuel trim?
140 knock counts?
.140 O2 voltage?

Something else?

140 BLM sorry I forgot to add this in

 

[Nick88]

So update. The truck has started to surge pretty bad at idle, I can watch the tach needle bounce a good amount and hear it running bad, I assume from it running lean. Any ideas?

 

[PlayingWithTBI]

Fuel trim,I'm guessing integrator.

I'd guess BLM. Ooops - I posted this too fast, shoulda read more before.

 

[Scooterwrench]

So update. The truck has started to surge pretty bad at idle, I can watch the tach needle bounce a good amount and hear it running bad, I assume from it running lean. Any ideas?

Do you have the means to read the O2 voltage? If you don't have it you may want to consider TunerPro RT and an ALDL cable so you can actually see what your engine is doing. I know you think the exhaust was pretty hot while pouring water down the intake but an immediate,drastic change in exhaust temps will FUp the O2. I've done it as well as toast the cat. I don't do that $hit no more!

 

[PlayingWithTBI]

The truck has started to surge pretty bad at idle, I can watch the tach needle bounce a good amount and hear it running bad, I assume from it running lean. Any ideas?

Or, your ICM is bad. A bad coil can ruin an ICM in no time - need to change them as a pair...

 

[Scooterwrench]

I'd guess BLM. Ooops - I posted this too fast, shoulda read more before.

It'll be alright,you just need a little more coffee!!!

 

[PlayingWithTBI]

It'll be alright,you just need a little more coffee!!!

Absolutely! I'm not even done with my 1st

 

[Scooterwrench]

Or, your ICM is bad. A bad coil can ruin an ICM in no time - need to change them as a pair...

Those normally just die altogether.

 

[Nick88]

Do you have the means to read the O2 voltage? If you don't have it you may want to consider TunerPro RT and an ALDL cable so you can actually see what your engine is doing. I know you think the exhaust was pretty hot while pouring water down the intake but an immediate,drastic change in exhaust temps will FUp the O2. I've done it as well as toast the cat. I don't do that $hit no more!

I can read O2 voltage. Havent looked too much at it but I know it still gets good cross counts and at a glance it look the same readings as always.

 

[Nick88]

Or, your ICM is bad. A bad coil can ruin an ICM in no time - need to change them as a pair...

Replaced coil with AC Delco and tossed in DynaMod ICM