Used truck problem: Low temperature reading

[Rahtid]

With my 90 i would get 21-24mpg, what rpm does the idle at,also rember there are two coolant temp sensor one for the gauge and one for the ecu

[noahwins]

I don't have a tach in the truck or on my light but it was hunting in a range of around 200-300 RPM. Rough idle and rich condition (bad MPG plus high CO and high HC on the previous smog test) being consistent with a bad ECM.

20141218_113558.jpg

No name rebuilder with a "born on" date inspired by those old beer ads. Doesn't look too promising. I googled the number and one of the first hits was a DSM guy complaining about shoddy work this guy did.

Oh no. I'm voiding the warranty.

20141218_113746.jpg

Opened it up and found globs of solder everywhere.

20141218_113816.jpg

Capacitor ooze and burn marks left on the board. I'm not an electronics expert but this looks like crap to me.

I don't know what it is about Florida and ECM rebuilding. It's a cottage industry there. I ordered an A1 Cardone rebuilt one off Rock Auto with a core charge instead of hassling with send-in-to-repair.

Do you have a part number for the temp sensor that hooks into the ECM? Can't see it on the fiche or Rock Auto.

[originalowner]

I don't have a tach in the truck or on my light but it was hunting in a range of around 200-300 RPM. Rough idle and rich condition (bad MPG plus high CO and high HC on the previous smog test) being consistent with a bad ECM.

20141218_113558.jpg

No name rebuilder with a "born on" date inspired by those old beer ads. Doesn't look too promising. I googled the number and one of the first hits was a DSM guy complaining about shoddy work this guy did.

Oh no. I'm voiding the warranty.

20141218_113746.jpg

Opened it up and found globs of solder everywhere.

20141218_113816.jpg

Capacitor ooze and burn marks left on the board. I'm not an electronics expert but this looks like crap to me.

I don't know what it is about Florida and ECM rebuilding. It's a cottage industry there. I ordered an A1 Cardone rebuilt one off Rock Auto with a core charge instead of hassling with send-in-to-repair.

Do you have a part number for the temp sensor that hooks into the ECM? Can't see it on the fiche or Rock Auto.

These photos are why I'm fine with a carbed 2.6...gas hog that it is. I just don't want to deal with that 'check engine light' crap and all kinds of electronics BS. YUK. LOL.

Sounds like you got a handle on it.