Exhaust gas temperatures

Sean Canney

Member
Mar 12, 2022
55
1
8
Howdy, hoping someone knows more than I do about exhaust gas temps. I have six cylinders in the 400-600 range and 1 and 4 are running at 100. This is at warmed up idle temps . Any thoughts ? I'm leaning towards valve adjustment .
 
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Mustang5L5

Put lubricant all over the balls
Mod Dude
Feb 18, 2001
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That cylinder is not firing.

Fuel
Compression
Spark

There are various checks to check if each is an issue. If you suspect valves, a compression test should tell you if that is the case. Otherwise if compression is fine, you have an injector not firing or a spark plug not igniting.

I recommend a new thread in the 5.0 forum vs this one in the welcome forum


I’m assuming this is the cobra replica with an EFI 302-based motor?
 
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Sean Canney

Member
Mar 12, 2022
55
1
8
That cylinder is not firing.

Fuel
Compression
Spark

There are various checks to check if each is an issue. If you suspect valves, a compression test should tell you if that is the case. Otherwise if compression is fine, you have an injector not firing or a spark plug not igniting.

I recommend a new thread in the 5.0 forum vs this one in the welcome forum


I’m assuming this is the cobra replica with an EFI 302-based motor?
Hey thanks for the correction. I'm new and haven't learned quite yet how to navigate. I have a 90 Gt. 5.0L supercharged mildly with a Paxton sn 2000. Trick flow intake . Hella ported patriot heads. Stock cam with 1.7 trick flow rocker arms. And the compression is great. 180 across all eight. New mass air meter set for the new 24 pound injectors. The car is fairly fast . Rebuilt about five thousand miles ago. It's built up for strength as well. Bottom end and heads everything is aro studs. Short headers
That cylinder is not firing.

Fuel
Compression
Spark

There are various checks to check if each is an issue. If you suspect valves, a compression test should tell you if that is the case. Otherwise if compression is fine, you have an injector not firing or a spark plug not igniting.

I recommend a new thread in the 5.0 forum vs this one in the welcome forum


I’m assuming this is the cobra replica with an EFI 302-based motor?
That cylinder is not firing.

Fuel
Compression
Spark

There are various checks to check if each is an issue. If you suspect valves, a compression test should tell you if that is the case. Otherwise if compression is fine, you have an injector not firing or a spark plug not igniting.

I recommend a new thread in the 5.0 forum vs this one in the welcome forum


I’m assuming this is the cobra replica with an EFI 302-based motor?
I'm sorry about the wrong forum. It's a 90 5.0 gt. Everything is new. Everything. Full msd ignition yada yada. Thanks for the heads up on the forum. I've tested the three things needed for it to run. I'm baffled. I even did leak down and compression. It is tight. 180 psi across the board and five pct. Leakdown. . I'll post it on the general site. Thanks for the info!