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Registered
Join Date: Oct 2007
Location: San Francisco, CA
Posts: 24
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My 87 325is Jerked Back & Forth While Driving
Recently, while driving on the freeway, my 87 325is started to jerked back and forth, as if there was no fuel going into the engine. It started out only happened on 5th gear but now it jerked on 2nd to 5th gears. I noticed the car would lose power if I keep stepping on the gas pedal BUT if I release the gas pedal a little then step on the gas, power would be restored. I could drive the car without the car jerked because as soon as the car start to jerk, I just release the gas pedal then step on it again. I changed the spark plugs, spark plug wire, idle control sensor, oxygen sensor, I even cleaned the fuel injectors still the car jerked back and forth EVERY TIME I stepped on the gas pedal ALL THE WAY to the floor. The feeling is the same as if there was no gas going to the engine then there's gas then no gas again. Violence small jerks considered the car was traveling 70+ MPH on the freeway. But as soon as I release the gas, the jerking stopped. If anybody knows the problem, please help me out. Thanks for reading this post.
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10-12-2008, 10:05 PM
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Moderator
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If you are sure its the engine and not the drive train I would suspect a vacuum or intake leak. Since its only under high load it maybe a crack in the intake tube that only opens up under high suction.
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HPDE Instructor (BMW / PCA / Apex) Here: 1997 M3/4 Byzanz/Magma ~ 2006 Yamaha R6 ~ 1997 R1100RT ~ 1991 Ford F-150 5.8l ~ 2015 Kia Optima Gone: 2001 330i Silver/Grey ~ 98 Camry V6 ~ 97 Camry I4 ~ 97 Mazda 626 I4 ~ 93 Sentra SE-R ~ 88 Toyota Truck I4 |
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10-13-2008, 07:08 AM
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Registered
Join Date: Oct 2006
Location: Germantown, MD
Posts: 155
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my old 89 325 did the same thing, did a full tune up (plugs, cap, rotor, wires, fuel filter and fpr) and it fixed the bucking/jerking.
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10-13-2008, 12:53 PM
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1997 BMW M3 3.2L I6
