1987 TBI 454 Suburban... It Runs! Kinda.

MrSony

MrSony

Comic Book Super Hero
Nov 15, 2014
4,597
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Des Moines, Iowa
Nope no code if there’s not enough fuel psi but it could cause other codes you really need a good scann tool to see what is going on it’s to bad you weren’t closer I have my old snap on brick yet and use it once in a while for stuff like this
I mean... I did to it the cheap way. With a paper clip. But if the scan tool lets me view a live readout of whats happening for that 30 seconds it'd be nice to have.
 
Gonzo1970

Gonzo1970

Master Mechanic
Supporting Member
Sep 30, 2018
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spicercars

spicercars

Apprentice
Jan 7, 2019
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Saginaw MN
If it's running that rich, I'd put a coolant sensor in first for all the reasons given (I don't think that would throw a code).
Think I've heard that before.
 
DRIVEN

DRIVEN

Geezer
Apr 25, 2009
5,498
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Owyhee County
If it's running that rich, I'd put a coolant sensor in first for all the reasons given (I don't think that would throw a code).
Yes. Codes are only set/stored if the ECM sees values outside of a given range. Example: If the operating range of a sensor is 1-10, it doesn't recognize a fault unless it sees 0 (say, shorted) or >11 (open circuit). The CTS is a good example for this since corrosion can cause it to see -38* so it adds buckets of fuel because it thinks it's at the south pole. Hypothetical range being -140* to 300*. It's not at a 0 or 11, just at .03 so no codes set. Make sense?
Sure, codes are valuable but so is raw data. Not saying for sure that CTS is your problem, but it's a likely suspect given your description.
 
8

81cutlass

Royal Smart Person
Feb 16, 2009
1,626
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Western MN
I had a coolant temp sensor go bad on my firebird 3800. It would start but run very poorly and die easily. Stumble, miss, ect. No check engine lights. I hooked my HPtuners up to it and low and behold the coolant temp sensor was stuck at -38° and dumping fuel. If I didnt have a scanner I wouldn't have known.
 
69hurstolds

69hurstolds

Royal Smart Person
Jan 2, 2006
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Oh, yeah. My bad. Get one that does both then. Cover all the bases.

When spending other people's money, you don't pay attention to details.
 
TURNA

TURNA

Geezer
Jul 24, 2009
7,010
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113
Socialist NY
This may sound nuts but check your battery ground cable.

Over the last 2 days after work I did a Nissan Altima

Running like poop, misfiring, stalling.

Was going crazy chasing coils plug sensors and codes only to find the battery ground able was hanging on by one copper strand.

I cant believe it even started.

Cable replaced runs like new.
 
MrSony

MrSony

Comic Book Super Hero
Nov 15, 2014
4,597
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Des Moines, Iowa
Replaced the coolant sensor, no change.
 

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