TBI motor ? Won't start @. -

[heavy iron]

1990 suburban 4x4 2500 won't start at -2 fires up at 5 deg but takes some time to warm up .looks like have to put a block heater on it . Never had to put one on a gas motor before .well never had a tbi before . Anyone running there's below zero having trouble starting .had a lot off carb 350 before that fire up below zero

 

[ktmoutfront]

Mine has started at -14. Just cranked slow, but that is a battery issue.

 

[swettysblazer]

Same, mine cranked up yesterday with a -10 wind chill

 

[heavy iron]

Well had to put a propane heater under it and got it going. Went to the local part store and picked up a three wire heated oxygen sensor hook it up seem to run better . I also ordered a block heater . battery is fine and I have a high tq starter . I did put dual exhaust on it three months ago

 

[heavy iron]

And -2 with 19 deg wind chill this morning

 

[dyeager535]

Dual exhaust, if effective, is going to cause it to run lean (if it will start), and that's going to be a larger problem when cold than hot. The heated O2 may be putting it into closed loop faster (GM sometimes ran them on a timer that requires reprogramming to allow closed loop quickly) and thus why you may have noticed a difference.

The inefficient stock exhaust flow may also help keep some of the heat and richer fuel mix in the cylinder.

 

[heavy iron]

Anyone running a dual exhaust on there tbi motor

 

[Blue85]

What's your fuel pressure?

 

[70jimmy]

Anyone running a dual exhaust on there tbi motor

I am and I have one oxy sensor on one side.

 

[heavy iron]

What's your fuel pressure?

Haven't checked it yet fuel pump is 2years old. But who makes a better pump then factory one

 

[thearborbarber]

It's a crap shoot.

 

[dyeager535]

Probably no one, I agree with the above. No one is suggesting you replace it. Borrow a pressure test setup from autozone if you have them, and find out if yours is still in spec. If it is, no problem with fuel pressure.

 

[heavy iron]

Well pulled that motor yesterday and put in a crate motor with a HEI distributor and a carburetor .my old motor had 268,000 on it.

 

[brans87]

That's one way to do it

 

[Blue85]

So what did you do about the fuel pump? Curious if you did a compression test on the old engine before pulling it.

 

[heavy iron]

So what did you do about the fuel pump? Curious if you did a compression test on the old engine before pulling it.

One year old new fuel pump in take was shot . Bearing on tbi 350 wiped out . Can't was good weekend swap moved on too body and working on interior.