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Thread: 98 k1500 Bad shudder
07-26-2013, 10:15 AM #1
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- Jul 2013
98 k1500 Bad shudder
I am new here and am not sure if this topic has came up before.
My wife drives a 98 K1500 5.7. It has 125xxx miles on it. It is completely stock besides a k&N filter and flowmaster mufflers.
We have been dealing with an issue for the past 25XXX miles and can not get it completely solved.
When going up large hills at highway speeds the truck will start to have a bad shudder and lose power and drop about 20mph. If you keep in it, it throws a check engine light. I have not checked the code in a while but it was throwing misfire cylinder 5.
We have changed:
cap and rotor
torque converter lockout solenoid
We also have checked for vacuum leaks and have found nothing.
I'm sure we have replaced other parts just cant think of them.
After replacing the lockout solenoid, the issue went away for a while but has now returned.
Let me know if you have any suggestions
07-26-2013, 11:01 AM #2
Welcome to GMTC!
2009 Chevrolet Silverado 1500 LT Z71 Crew Cab "All-Star Edition"
Line-X'd Custom Brush Guard(Heavy Duty)
5.3L Flex Fuel
275/65R18 Toyo Open Country AT2's
2" Rough Country Leveling Kit(want to get the 2.5 RC kit)
EGR In-Channel Vent Visors
Exterior PLUS Package
Interior PLUS Package
K&N Drop-In Air Filter
Cat-Back Dual Exhaust
Diablo Sport Predator(AFM Disabled)
Next Planned Mods
Blacked out Tail Lights
07-27-2013, 12:22 AM #3
How many times have you cleared and checked the code? Does it always come up P0305 or does it sometimes come up other cylinders or general P0300?
Where the problem shows up while climbing hills, one of my first thoughts is a fuel delivery issue. After climbing, the engine gets starved for fuel and starts to misfire. If you have not yet put a fuel pressure gauge on it, I would do so and see if the fuel pressure is dropping off before it starts to bog/misfire.'98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
'92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
"My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World
07-29-2013, 08:31 AM #4
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- Jul 2013
07-29-2013, 09:19 AM #5
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