Hi guys. I have been noticing a slight jerk when I'm at a steady speed. It's quite noticable on a flat road. If I give it any gas, it will go away. It's just a constant speed thing. I'm wondering if it's a clogged fuel injector or something. I'm having my mechanic perform the inspection so I can have it passed. Any ideas what might be causing the jerking?
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Bad plug or wire probably.1989 Grand Marquis LS
flat black, 650 double pumper, random cam, hei, stealth intake, Police front springs, Wagon rear, Police rear bar, wagon front ,exploder wheels, 205/60-15 fronts 275/60-15 rears, 1 5/8" headers, 2.5" offroad x pipe, Eclipse front bucket seats, Custom floor shifter, 4.10 gears, aluminum driveshaft and daily driven. 16.77@83mph -
Wires and plugs have been replaced. The car did this before I replaced the plugs and wires.Comment
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It could be a clogged injector. Did you change the cap and rotor with the plugs and wires?1989 Grand Marquis LS
flat black, 650 double pumper, random cam, hei, stealth intake, Police front springs, Wagon rear, Police rear bar, wagon front ,exploder wheels, 205/60-15 fronts 275/60-15 rears, 1 5/8" headers, 2.5" offroad x pipe, Eclipse front bucket seats, Custom floor shifter, 4.10 gears, aluminum driveshaft and daily driven. 16.77@83mphComment
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No, I didn't. But I vigorously inspected the cap for cracks. I didn't see any.Comment
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Sometimes they get tiny where you cant see em. Id swap the cap and run some injector cleaner through it.1989 Grand Marquis LS
flat black, 650 double pumper, random cam, hei, stealth intake, Police front springs, Wagon rear, Police rear bar, wagon front ,exploder wheels, 205/60-15 fronts 275/60-15 rears, 1 5/8" headers, 2.5" offroad x pipe, Eclipse front bucket seats, Custom floor shifter, 4.10 gears, aluminum driveshaft and daily driven. 16.77@83mphComment
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I was going to have him do that, if it doesn't pass right away. Run the injector cleaner that goes right through the fuel rail.Comment
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Hi 86VickyLX
Over advanced ignition timing.
Regards
DereckPresident and founder of The Turbine Wheel Appreciation Society and Little Debbie Cake Connoissuer
Also "The Pondside Pain In Your Posterior"Comment
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Over advanced? It's set at 10* BTDC, so I should have it retarded? It smells a tad rich already.Originally posted by Dereck View PostComment
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are all your mounts good? trans/engine? have you fiddled with tv pressure? was it set correctly with a gauge?
p.s. you should try slightly jerking it at varied speeds..Give a man a fish and he will be fed for a day. Teach a man to fish and he will promptly forget that he once did not know, and proceed to call anyone who asks, a n00b and flame them on the boards for being stupid.Comment
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All mounts are fine. Transmission has been rebuilt, and TV pressure was set by the shop.
It does the same thing at higher speeds too. Constant speeds mind you. It's more noticable at like around town speeds like 25.Comment
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my car used to do it too, i wish i could tell you what fixed it but it went away on its own. that or i just happened to change out what the problem was through the yearsGive a man a fish and he will be fed for a day. Teach a man to fish and he will promptly forget that he once did not know, and proceed to call anyone who asks, a n00b and flame them on the boards for being stupid.Comment
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mine did that for a couple years but seemed to stop after i changed a bad ignition module.
can't swear it was related, but its been fine since.
good luck, Bills265.photobucket.com/albums/ii208/brokebill/
"Ain't we gonna bury him ?"
"Buzzards gotta eat same as worms."
----outlaw josey wales
(88 LTD Crown Vic LX-Ruby)Comment
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Mine did the same thing. Never really bothered to fix it since I'm doing a motor swap anyway. But I did have an idea. When I pulled the old motor out the timing chain had a ton of play in it. I don't know if maybe the cam timing was jumping around. Just a thought.1984 CV tudor 351W, 4bbl, 5-speed best time in the 1/8 8.39 at 80 with 1.80 60ft time.
2006 P71, 1988 Bronco II, 1986 Baby LTD(5.0 & T5 swap in progress), 1976 16' Hobie Cat, 12' AquaFinn
http://www.cardomain.com/ride/2651997 UPDATED 20100826
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