Unknown mechanical or electrical issue
#1
Unknown mechanical or electrical issue
'94 bonneville 106k miles.
Starting a month ago car began to run rough on the road and I figured it was because I took it to walmart and they poorly balanced the tires. Problem quickly got worse and began to lurch and the back end feels like it drags, especially when accelerating or cruising at higher speeds (50+). Problem is considerably worse in overdrive. The lurching and rumbling can be temporarily alleviated by the feathering the gas a bit, but returns shortly.
When sitting at stoplights the volt gage sometimes jumps a bit and then drops to around 9-10 volts until you starting driving again.
RPM seems to run stable. Runs smooth enough in park but with a distinct, rhythmic "clacking" sound.
Gas mileage has also dropped about 12%.
No check-engine light.
Recently replaced (6 months or less): MAF sensor, serp belt, alt, fuel pump, starter, plugs + wires. None of these but the plugs were replaced in relation to this current situation.
I'm leaning toward valve or injector issue. Weather hasn't permitted much work on it in the last 2 days. Thanks for any feedback.
Starting a month ago car began to run rough on the road and I figured it was because I took it to walmart and they poorly balanced the tires. Problem quickly got worse and began to lurch and the back end feels like it drags, especially when accelerating or cruising at higher speeds (50+). Problem is considerably worse in overdrive. The lurching and rumbling can be temporarily alleviated by the feathering the gas a bit, but returns shortly.
When sitting at stoplights the volt gage sometimes jumps a bit and then drops to around 9-10 volts until you starting driving again.
RPM seems to run stable. Runs smooth enough in park but with a distinct, rhythmic "clacking" sound.
Gas mileage has also dropped about 12%.
No check-engine light.
Recently replaced (6 months or less): MAF sensor, serp belt, alt, fuel pump, starter, plugs + wires. None of these but the plugs were replaced in relation to this current situation.
I'm leaning toward valve or injector issue. Weather hasn't permitted much work on it in the last 2 days. Thanks for any feedback.
#4
I put dielectric grease around the inside of the boot and the ceramic insulator - it doesn't belong on the terminals. Car still ran the same way after replacing the plugs.
Gonna head out there with a screwdriver this afternoon and listen to the injectors.
#5
Senior Member
True Car Nut
spray the coils with water while running it may be leaking voltage to the center screw. the dielectric strength of the plastic on the coil can break down as mush as the wires. if the engine stumbles or you see arcs theres your issue
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cmoseby
Everything Electrical & Electronic
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07-23-2004 11:55 PM