exhaust manifolds glowing

Asked by Jan 21, 2016 at 01:04 AM about the 1998 GMC Sierra C/K 2500

Question type: Maintenance & Repair

I have a 98 GMC Sierra 3 quarter ton 4
wheel drive 5.7 Vortec new fuel pump spark
plugs and  wires distributor cap. exhaust
manifolds glowing any ideas

4 Answers

19,180

Clogged catalytic converter.

247,155

or leaky fuel injector dumping raw fuel into the exhaust.

72,375

I'll go with the plugged catalytic converter, It would have to be a lean condition and running hard for fuel to make the manifold glow. Too much fuel would make it bog down.

97,125

I worked on a lot of motor homes in my days and everything one would come with glowing manifolds we always found an exhaust restriction somewhere in the system and usually it was in the mufflers, you could actually see a hot spot on the outside of the mufflers. So that's my two cents worth.

Your Answer

Add photo

Related Questions

  • exhaust manifolds glowing 4 answers

    I have a 98 GMC Sierra 3 quarter ton 4 wheel drive 5.7 Vortec new fuel pump spark plugs and wires distributor cap. exhaust manifolds glowing any ideas

    1998 GMC Sierra C/K 2500

    -

    Maintenance & Repair

  • No spark 2 answers

    Ive got a 1998 GMC C2500 5.7L Vortec. Ive done a motor swap from a 1998 Chevrolet 1500 Z71 4x4 5.7L Vortec. I got the motor running in my truck back in October and it was misfiring due to having the...

    1998 GMC Sierra C/K 2500

    -

    Maintenance & Repair

  • What is the sensor on the block near the starter? 2 answers

    1988 GMC Sierra C/K 2500

    -

    Maintenance & Repair

  • 1995 gmc 2500 sle will not shift to overdive 1 answer

    Had the transmission replaced < 1 year ago with a re-manufactured one. Now it wont shift into over drive. user to get 50 mph at about 1500 rpm approx, now best is 50 mph at 2000 rpm approx.

    1995 GMC Sierra C/K 2500

    -

    Maintenance & Repair

  • My truck when it snows outside or gets cold will cut out as I begin to accelerate in any gear. 1 answer

    I put new plugs and rotor cap but that didn't fix it. It only does this when it snows outside or is really cold. When the weather warmed up and it sat in the garage for a few days it ran just fine...

    1989 GMC Sierra C/K 2500

    -

    Maintenance & Repair

Sierra C/K 2500

Looking for a Used Sierra C/K 2500 in your area?

CarGurus has thousands of nationwide listings and the tools to find you a great deal.

Postal Code:

Shortcuts

Search GMC Sierra C/K 2500 Questions

GMC Sierra C/K 2500 Experts

#1 rrussellus
rrussellus
Reputation 20
#2 mastermaniam
mastermaniam
Reputation 10
#2 mrmoony
mrmoony
Reputation 10
View All

Related Models For Sale

Used GMC Sierra 2500
7 listings starting at $5,995
Used GMC Sierra 1500
182 Great Deals out of 9,345 listings starting at $2,995
Used Ford F-250 Super Duty
15 Great Deals out of 849 listings starting at $2,450
Used GMC Yukon
14 Great Deals out of 735 listings starting at $6,950
Used Chevrolet Silverado 1500
133 Great Deals out of 9,197 listings starting at $100
Used Dodge Ram 2500
11 Great Deals out of 99 listings starting at $6,995
Used Ford F-250
3 listings

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.