88 Suburban 5.7 TBI chip

[BR@NDON]

Thanks Jim,
The sensor does thread into the collector a few inches pre-flange. Is it still too far off?

 

[Jims86]

Thanks Jim,
The sensor does thread into the collector a few inches pre-flange. Is it still too far off?

Even if you had mid length headers, its too far.
1 wire for shortys or stock manifolds, 3 wire heated for anything else.

 

[BR@NDON]

Alright, 3-wire it is.

Am I chasing my tail trying to find a stock PROM to pass emissions?

 

[Jims86]

Alright, 3-wire it is.

Am I chasing my tail trying to find a stock PROM to pass emissions?

Well, maybe.
I want to make sure you have everything set up properly for that particular exhaust setup. The 3 wire o2 MIGHT be all you need to get passed smog.
The one wire sensor is probably sending your ECM into open loop, which causes it to revert to factory settings for a cold engine, which is most likely too rich for an engine thats at operating temp.
But, like I said before, you may want to have a little talk with your smog guy, and see if he would be willing to help you with some sniffer tests to get the truck right. If he's a nice guy, and sees that you are trying to correct the problem, he may be willing to help.
Also, a 195* thermostat is very important for the same reason, the cooler the engine runs, from what is normal factory temps, the ECM will add a little more fuel than necessary.
And dont forget the laquer thinner, and a good drive in 3rd. this is to help clean up your cats, which may be at low efficiency, due to the rich conditions that you have been driving under.
All of this should mak a drastic improvement on the smog machine, but if its not enough, then we can search for another chip, which wont be difficult at all. Oh yeah, after you get the new o2 wired up, and confirm the thermostat, disconnect your battery for 15 seconds(you should really disconnect it before working on the truck) so the ecm relearns the engine with the new sensor.

 

[89Suburban]

I got the one out of mine Jim, think he can use it?

 

[Jims86]

If you have a smog pump, yes, he could.

 

[89Suburban]

Nope.

 

[BR@NDON]

Thanks for the offer 89'.

Are all 3 wire sensors heated?

 

[Jims86]

Thanks for the offer 89'.

Are all 3 wire sensors heated?

no, the black wire is the sensor to ECM wire. the white wires ar the pos and neg for the heater element inside the sensor.

 

[89Suburban]

Jim, are the computers in similar model years full size vans the same as the trucks? I think some of those vans I saw today might still have some computers. I didn't really focus on it but it is something I can look for next time on the TBI vans. I got to start paying attention to that and even start grabbing some sensors off those things.

 

[Jims86]

Jim, are the computers in similar model years full size vans the same as the trucks? I think some of those vans I saw today might still have some computers. I didn't really focus on it but it is something I can look for next time on the TBI vans. I got to start paying attention to that and even start grabbing some sensors off those things.

Yup...87-89 7747 ecm's.

 

[89Suburban]

Yup...87-89 7747 ecm's.

I'll try and remember to look.

 

[RetroC10Sport]

ASTRO 87-90 Elec Cont Module (ECM); (behind right kick panel), 6-262 (4.3L), ID 1227747

ASTRO 91 Elec Cont Module (ECM); (behind right kick panel), ID 1227747

BLAZER S10/JIMMY S15 90 Elec Cont Module (ECM); (6-262, 4.3L)

BLAZER/JIMMY (full size) 87 Elec Cont Module (ECM); 8-305 (5.0L)

BLAZER/JIMMY (full size) 87-90 Elec Cont Module (ECM); 8-350 (5.7L)

BLAZER/JIMMY (full size) 91 Elec Cont Module (ECM); 8-350 (5.7L), ID 1227747

BLAZER/JIMMY (full size) 92-93 Elec Cont Module (ECM); (8-350, 5.7L), ID 1227747

CHEVROLET FORWARD CONTROL 87 Elec Cont Module (ECM)

CHEVROLET FORWARD CONTROL 88 Elec Cont Module (ECM); gas

CHEVROLET FORWARD CONTROL 89-90 Elec Cont Module (ECM); gasoline, ID 1227747

CHEVROLET FORWARD CONTROL 91 Elec Cont Module (ECM); 6-262 (4.3L), ID 1227747

CHEVROLET FORWARD CONTROL 91 Elec Cont Module (ECM); 8-350 (5.7L), ID 1227747

CHEVROLET VAN 87 Elec Cont Module (ECM)

CHEVROLET VAN 88 Elec Cont Module (ECM); gas

CHEVROLET VAN 89-90 Elec Cont Module (ECM); gasoline, ID 1227747

CHEVROLET VAN 91 Elec Cont Module (ECM); 6-262 (4.3L), ID 1227747

CHEVROLET VAN 91 Elec Cont Module (ECM); 8-305 (5.0L)

CHEVROLET VAN 91 Elec Cont Module (ECM); 8-350 (5.7L), ID 1227747

CHEVROLET 10 PICKUP 87 Elec Cont Module (ECM)

CHEVROLET 1500 PICKUP 88 Elec Cont Module (ECM); gasoline

CHEVROLET 1500 PICKUP 89-90 Elec Cont Module (ECM); gasoline, ID 1227747

CHEVROLET 1500 PICKUP 91 Elec Cont Module (ECM); 6-262 (4.3L), ID 1227747

CHEVROLET 1500 PICKUP 91 Elec Cont Module (ECM); 8-305 (5.0L)

CHEVROLET 1500 PICKUP 91 Elec Cont Module (ECM); 8-350 (5.7L), ID 1227747

CHEVROLET 20 PICKUP 87 Elec Cont Module (ECM)

CHEVROLET 20 PICKUP 88 Elec Cont Module (ECM); gas

CHEVROLET 2500 PICKUP 88 Elec Cont Module (ECM); gasoline

CHEVROLET 2500 PICKUP 89-90 Elec Cont Module (ECM); gasoline, ID 1227747

CHEVROLET 2500 PICKUP 91 Elec Cont Module (ECM); 6-262 (4.3L), ID 1227747

CHEVROLET 2500 PICKUP 91 Elec Cont Module (ECM); 8-305 (5.0L)

CHEVROLET 2500 PICKUP 91 Elec Cont Module (ECM); 8-350 (5.7L), ID 1227747

CHEVROLET 30 PICKUP 87 Elec Cont Module (ECM)

CHEVROLET 30 PICKUP 88 Elec Cont Module (ECM); gasoline

CHEVROLET 3500 PICKUP 88 Elec Cont Module (ECM); gasoline

CHEVROLET 3500 PICKUP 89-90 Elec Cont Module (ECM); gasoline, ID 1227747

CHEVROLET 3500 PICKUP 91 Elec Cont Module (ECM); 8-350 (5.7L), ID 1227747

GMC 1500 PICKUP 87 Elec Cont Module (ECM)

GMC 1500 PICKUP 88 Elec Cont Module (ECM); gasoline

GMC 1500 PICKUP 89-90 Elec Cont Module (ECM); gasoline, ID 1227747

GMC 1500 PICKUP 91 Elec Cont Module (ECM); 6-262 (4.3L), ID 1227747

GMC 1500 PICKUP 91 Elec Cont Module (ECM); 8-305 (5.0L)

GMC 1500 PICKUP 91 Elec Cont Module (ECM); 8-350 (5.7L), ID 1227747

GMC 2500 PICKUP 87 Elec Cont Module (ECM)

GMC 2500 PICKUP 88 Elec Cont Module (ECM); gasoline

GMC 2500 PICKUP 89-90 Elec Cont Module (ECM); gasoline, ID 1227747

GMC 2500 PICKUP 91 Elec Cont Module (ECM); 6-262 (4.3L), ID 1227747

GMC 2500 PICKUP 91 Elec Cont Module (ECM); 8-305 (5.0L)

GMC 2500 PICKUP 91 Elec Cont Module (ECM); 8-350 (5.7L), ID 1227747

GMC 3500 PICKUP 87 Elec Cont Module (ECM)

GMC 3500 PICKUP 88 Elec Cont Module (ECM); gasoline

GMC 3500 PICKUP 89-90 Elec Cont Module (ECM); gasoline, ID 1227747

GMC 3500 PICKUP 91 Elec Cont Module (ECM); 8-350 (5.7L), ID 1227747

GMC FORWARD CONTROL 87 Elec Cont Module (ECM)

GMC FORWARD CONTROL 88 Elec Cont Module (ECM); gasoline

GMC FORWARD CONTROL 89-90 Elec Cont Module (ECM); gasoline, ID 1227747

GMC FORWARD CONTROL 91 Elec Cont Module (ECM); 6-262 (4.3L), ID 1227747

GMC FORWARD CONTROL 91 Elec Cont Module (ECM); 8-350 (5.7L), ID 1227747

GMC VAN 87 Elec Cont Module (ECM)

GMC VAN 88 Elec Cont Module (ECM); gasoline

GMC VAN 89-90 Elec Cont Module (ECM); gasoline, ID 1227747

GMC VAN 91 Elec Cont Module (ECM); 6-262 (4.3L), ID 1227747

GMC VAN 91 Elec Cont Module (ECM); 8-305 (5.0L)

GMC VAN 91 Elec Cont Module (ECM); 8-350 (5.7L), ID 1227747

S10/S15/SONOMA 88-90 Elec Cont Module (ECM); 6-262 (4.3L)

SAFARI (GMC) 87-90 Elec Cont Module (ECM); (behind right kick panel), 6-262 (4.3L), ID 1227747

SAFARI (GMC) 91 Elec Cont Module (ECM); (behind right kick panel), ID 1227747

SUBURBAN 10 87 Elec Cont Module (ECM)

SUBURBAN 10 88 Elec Cont Module (ECM); gas

SUBURBAN 1500 87 Elec Cont Module (ECM)

SUBURBAN 1500 88 Elec Cont Module (ECM); gas

SUBURBAN 1500 89-90 Elec Cont Module (ECM); gasoline, ID 1227747

SUBURBAN 20 87 Elec Cont Module (ECM)

SUBURBAN 20 88 Elec Cont Module (ECM); gas

SUBURBAN 2500 87 Elec Cont Module (ECM)

SUBURBAN 2500 88 Elec Cont Module (ECM); gas

SUBURBAN 2500 89-90 Elec Cont Module (ECM); gasoline, ID 1227747

YUKON 92-93 Elec Cont Module (ECM); (8-350, 5.7L), ID 1227747

 

[bucket]

Hmm. I still have the stock chip in my '88 4x4 Burb, I removed the smog pump though. Only problem is I need a chip in the truck to keep it going everyday. If 89S's extra would work in mine, I could stick it in there and then send my stock chip to Brandon.

Would that work?

 

[Jims86]

Hmm. I still have the stock chip in my '88 4x4 Burb, I removed the smog pump though. Only problem is I need a chip in the truck to keep it going everyday. If 89S's extra would work in mine, I could stick it in there and then send my stock chip to Brandon.

Would that work?

Sure would!
I dont know if his SC is a stage 1 or 2 though, but a stock gm Calibration might make the sniffer happy, along with a 3 wire o2.
I think his 1 wire O2 sensor being 50 miles downstream from the engine is his big issue though.