SEL Came on, flashing.

Anything related to the factory RPO Crew Cab.

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anvil
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SEL Came on, flashing.

Post by anvil »

I have a 2002 GMC that I bought new, love the truck.
The HVAC fan only worked on position 3 and 4, and I had to replace the oil cooling lines a few weeks ago. The the SEL came on, and it was flashing at me, so I took it to the dealer and needed new injectors.I had it fixed.
Coming home from the dealer my odometer turned 40K miles.
These things should not happen to a truck with such low mileage.
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HenryJ
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Post by HenryJ »

Unfortunately it does. Sometimes it is age and lack of use more than mileage.

I would imagine your injector replacement was due to sticking poppets. That may have been prevented by avoiding fuel additives that coat the surfaces and a maintenance dose of injector cleaner every other oil change or at least annually.

If you had HVAC switch problems, be sure to read the sticky on the transfercase switch. I would hate for you to be back there replacing the rest of the HVAC vacuum controlled system.

"Speed doesn't kill, suddenly becoming stationary does." - Richard Hammond
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anvil
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Post by anvil »

I never used any additives in the fuel.
A sticking poppet was the culpret.All fixed now, seems to run better than ever.

The HVAC switch was the fan, electrical nothing vacuum, unless they are related to the transfer switch some how.

Did the brakes all around, two new tires.

This is where I will jinx myself......I have the original battery.
I was going to get a new one, but all the other maintenance took precedance.
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HenryJ
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Post by HenryJ »

Fuel comes with additives. I avoid the Techron additive that Chevron uses.

"Speed doesn't kill, suddenly becoming stationary does." - Richard Hammond
"Speed is just a matter of Money - How fast do YOU want to go?"-Mechanic from Mad Max-
If at first you don't succeed - Don't take up Skydiving!
- ThunderII KE7CSK
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Horsehammerr
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Post by Horsehammerr »

Here I go again. 4 oz. Marvel oil every 12 gls. of gas in your tank. Very clean Throttle body, Injectors, Valves and your fuel pump w/ gauge sending unit are kept clean and lubed. I've been on this system for 25000 miles now and all I can say is it works and may have something to do with my average 23 MPG hiway miledge. :D :!: 8)
[size=75]'02ZR5 YellowCruzCab-Airbox chopped,Quadlights,Intake defuser chopped,Precat chopped,HD Bilsteins, 9x16 '84 Corvette wheels, NEXEN 245/50 tires, front & rear Sway bars, All Poly bushings in full suspension, front lowered 3 1/2", ZR2 rearend with 5" suspension lowering , FUN FUN FUN
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Post by roadrunner »

Ditto on Hammerr's "recipe". Same here.
2001 CC LS, pewter, stock, 4.3,Wait4meperformance, CFM throttle blade, Helix throttle body spacer, 4spd auto, 3button electric 4x4 shift, heavy duty factory suspension, Bilsteins, 1" rear wheel spacers, skid plates.