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1999 GMC Suburban service engine light comes on when it rains and goes out a few days later? Anyone else have this problem?

When it rains the service engine light comes on and will go off a few days later. Also the wipers won't off until they get good and ready, but that may be unrelated.

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  • tracey walker Feb 16, 2012

    thanks, but changing the air filter didn't work.

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  • 245 Answers

Change air filter. the wiper relay may be sticking.

Posted on Feb 15, 2012

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Posted on Jan 02, 2017

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emissionwiz
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SOURCE: water leaking in blower motor

pull the plastic grate cover off the cowl at heater AC outside air intake at the base of the windshield and check to see that the cowl drains are not plugged with leafs or other debris, this is the common cause, if the drains are clear seal around the cowl air intake with automotive silicone caulking.

Posted on Apr 01, 2009

motor1258
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SOURCE: How do you hook up trailer lights on my 1999 gmc 4x4 Suburban

If your only going with a flat 4 connector, you will have a connection behind rear bumper area that you can buy an adapter to put between the connectors & flat 4 will connect from there, otherwise you can splice into your light harness in back of cargo area, behind panel in the corner. That's all provided your only going with a flat 4. If you need more info, just let me know.

Posted on Jun 28, 2009

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SOURCE: my 95 gmc suburban wont start when it rains

Ignition wires, cap, rotor and coil are all sensitive to humidity. When buying new ones look for parts with a high dielectric number...they tend to resist arcing better than ones with lower ratings. Wire sets with high silicone content not only resist dampness better but resist burn-through if they inadvertently contact exhaust etc. With ignition parts, generally you get what you pay for...good stuff costs more but is overall better.

Posted on Aug 30, 2009

oneStan
  • 430 Answers

SOURCE: 1999 gmc suburban has water loss

Anti-freeze inside the passenger compartment generally will leave a film on the windshield, and have a bit of a greasy feel. Ideally, if you take a white paper towel or napkin & soak up the liquid, the color would quickly identify it as anti-freeze. even though it's a trace amount.

I would expect if you aren't smelling any anti-freeze that you probably are dealing with something else. Water or brake fluid. are about the only 2 other options. Water from a plugged up drain on the heater & A/C box or a potential seal around the windshield which you would have to track down with a water hose & a helper. I would suggest a pressure test on the cooling system to prevent engine damage. If you're using coolant, you're potentially going to overheat sooner or later. That would identify the heater core or wherever the leak may be going. good luck

Posted on Jan 29, 2010

  • 553 Answers

SOURCE: 1999 GMC Suburban turns over but won't start

It sounds like the choke is the most likely culprit. Take the air cleaner off the throttle body/Carburater. Have someone cover most of the throttle body/Carburater intake, if you don't have help use a piece of heavy cardboard. If it starts up right away it's the choke. Note: if you use cardboard don't rev the engine you may **** the cardboard into the engine.
I'm afraid with all the different types of choke controls I can't tell you how to fix your choke with out actually seeing it.

Posted on Jun 06, 2010

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