Bad Engine Skip
10-29-02, 03:24 PM
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Bad Engine Skip
Hey fellow SCrs, have any of you had this problem? Car starts with no problem. It runs smooth then starts to skip with slight engine shake. The skip is more pronounced and aggrevating during gear changes and from full start (1st gear). I've replaced the plugs and ohm'd all the wires. The rotors needed a bit of cleanup but were not to bad. I cleaned the engine last week and now wonder if somehow I got water into some place where it definately should'nt have gone. It sounds and feels like a vacuum leak, but I can't find one (at least not an obvious one) Is there some "common" part that I should focus on? I plan on repairing this myself, but I don't want to spend too much time testing "good" parts before I find the culprit that's causing my engine to run like a wornout Dodge :-) I heard that the throttle body may need cleaning,,, would a dirty throttle body cause such a drastic change so quickly? thanks in advance
SC4Me
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10-29-02, 03:35 PM
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Don't know,,, the throttle body isn't damaged. it probably does need cleaning, so I'll do it anyway. Still wondering if it's an electrical component,,,,hmm
10-30-02, 12:12 AM
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O.K. I just finished cleaning the throttle body, boy was is dirty! Unfortuanately, it did stop the misfiring but I can feel the boost in power. I changed the plugs after I washed the engine. I guess the rotors/cap and wires are my next step,,,, unless you guys have a better ,less expensive tip to try first :-)
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10-30-02, 12:45 AM
#9
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yea, i too would definitely like to know as my sc has gotten a tad hesitant when put under heavier throttle and im sure all it needs is a good cleaning. any certain brands/types of cleaners that should be used? also, what should i use to do it, a damp rag or something? is the throttle body right up on top of the engine, towards the back of the bay near the windshield like in a bmw?
Last edited by kylesc400; 10-30-02 at 12:46 AM.
10-30-02, 03:47 AM
#10
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Throttle body cleaning....
Get a long screwdriver, a rag and an elastic band. It's usually the entrance where the butterfly is that all the dirt accumulates. wrap the rag around the cloth and tie it down with elastic bands. turn engine off and open the butterfly and stick the rag/screwdriver in and rub around the butterfly switch. It's really easy with a Soarer GT as you just pull the cooler pipe off and the butterfly is right there.
Toan.
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10-30-02, 10:51 AM
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I used Havoline Throttle body cleaner. It works great! The gook was about 1/8" thick. The spray nozzel is designed to get all the way in. The cleaner dissolved the buildup like butter in a hot skillet! :-) I used a rag to get as much excess as possible. Some of it apperantly with into the cylinders,,,as this was obvious the first time I turn the engine over. It scared the heck out of me. the engine sounded as if I'd dropped a bolt in it. After several scary turnovers she fired up ,,,spitting out serious goop from the exhaust,,,but then she smoothed out and reved great. Hope this helps,,,,
10-30-02, 07:08 PM
#12
Lexus Test Driver
The "engine shake" you feel at 40 may be the torque converter. When it locks up it can shake or make the car feel like its sputtering. It's common with these cars. I've been told a tranny fluid change is helpful, but I haven't done that yet. Check your tranny fluid level.
10-30-02, 08:07 PM
#14
Lexus Test Driver
oh rushgator2112, thanks for replying on my problem. Actually I did also change tranny fluid 2,3 months ago. I'm assuming that my problem is causing by o2 sensor (i got engine check warning light, code 25). I'll change this weekend or next weekend. I'll see if it'll fit it.
10-30-02, 08:16 PM
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could anybody tell me exactly how to gain access to the throttle body? i plan on doing a makeover on my car on saturday (tranny fluid, what should i have done - flush, refill or what? im getting that 40mph vibration too) and want to clean off the throttle body as the power delivery isnt as smooth as id like.