1998 GMC 1500 Pickup Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 1998 GMC 1500 Pickup

1998 GMC 1500 Pickup Problems

Check Engine Light With Code P1870

Vehicles equipped whit a 4 speed automatic transmission may develop a harsh 1-2 shift and/or illumination of the Check Engine Light with code P1870 stored. This can be caused by wear of the bore for the TCC isolator and regulator valves in the valve body. This condition does not commonly occur until the transmission reaches normal operating temperature. If the valve body is worn, replacement will be necessary to correct this concern.

Check Engine Light and Misfire Due to Stuck Fuel Injectors

One or more fuel injectors may become stuck closed causing an engine misfire  and the Check Engine Light to illuminate. Our technicians tell us that this problem can be caused by some fuel additives. There are special procedures which may be able to restore the affected injector. If this fails the affected injector must be replaced.

Quick-Connect Fittings For Heater Hoses May Leak Engine Coolant

The quick-connect fittings for the heater hoses tend to leak engine coolant. This problem commonly occurs because the metal housing has become brittle, which can break and cause leaks.

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1998 GMC 1500 Pickup Questions

My passlock security light won't turn off after several reset attempts (1 answer)

After my truck died in some real bad rain I replaced the distributor cap, wires, and plugs. Then there was no fuel pressure! So I replaced the fuel regulator (on spider injector), fuel filter, and fuel pump. She had great fuel pressure, spark and compression! So now I'm at the anti-theft pas...

What should the fuel pressure be ? Good flow out side of frame filter. (2 answers)

What would make hard 2 start, add a little fuel at the breather helps (1 answer)

Vacuum is good with crankcase out of the circuit, when running won't accept full throttle unless you ease into it, played w with timing, cap and rotor not 2 bad haven't checked codes. Vortec V8 350

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1998 GMC 1500 Pickup Recalls

Fuel Tank Rubs Causing Noise And Possible Leak

The fuel tank may rub on the body at the front inner corner, causing a noise and possible fuel tank damage resulting in leakage of fuel. Dealers will inspect the fuel tank for wear and install a spacer between the fuel tank and body, as well as replace leaking tanks free of charge to resolve the concern.

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1998 GMC 1500 Pickup Reviews

Bought my '98 new and have put 249k fairly trouble free miles on it. Ditto on the fuel pump - lost mine 1500 miles from home and paid the price. Ride is uncomparable - I ordered a decked out 2wd with 5.7 and tow package and sound system - better road rig than a Caddy! Going to keep it for some time to come - better than a new one.
I love my truck! These trucks really are pretty rock solid, but it IS necessary to service these vehicles on time and with quality fluids and parts. The biggest problem areas with these trucks that I have found are the fuel pump, intake manifold gaskets, A/C compressor, inner and outer door handles, and maybe I'll throw in the distributor but that's not really a big deal as long as you are ge...
great trk lots of miles 305 engine never a major problem

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