Strange issue with engine.
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Strange issue with engine.
Hello,
7-10k miles I got a valve lash adjustment on my 2003 cl type s 6mt. Car is currently at 246k.
after the adjustment, I noticed the engine sounded dead quiet, had slight bit more power and I went from 20 mpg to 23-24mpg.
however, over a few thousand miles after the adjustment, I noticed that 5–7 mins after driving on a cold engine that’s warmed up, the car will buck at around 2k rpm. I just thought maybe my friend messed up on an intake valve...this sensation of bucking or Rpm suddenly dropping slightly and slight bucking is especially evident when the a/c compressor is on.
i had a small pull against a friend a few weeks back, 244k, and the next day my CEL was on. I got it checked and it was fuel related. Said something about running rich. However, the light turned off by itself in 30-40 miles of driving and turning the car off.
Considered my self lucky.
well, more recently, a day ago, I noticed my car running a bit odd during steady speed and rpm. So at 55 mph and 1850-1900 rpm, I’ll feel that the engine is losing power VERY SLIGHTLY, but it comes back. Some sort of hesitation...the loss of power results in just 50-80 rpm loss but returns
Today I got a CEL again, and I just kept driving around. I turned the car off, came back a few hours later and was going home and noticed the CEL light was off again. But on the way home it kept doing the hesitation thing once or twice until I turned the ac off.
not sure if I need new fuel injectors... we’ve replaced a coil pack that was bad 15-20k miles ago n the rest fired fine so I know it’s not a spark issue. Especially since we replaced the plugs during valve lash adjustment with ngk.
i admit sometimes I run really low on gas n not too long ago my car nearly died because I forgot my money at home. So not sure if I messed up an injector.
i use only 93 octane and run fuel injector cleaner,(lucas) and seafoam thru there very often.
7-10k miles I got a valve lash adjustment on my 2003 cl type s 6mt. Car is currently at 246k.
after the adjustment, I noticed the engine sounded dead quiet, had slight bit more power and I went from 20 mpg to 23-24mpg.
however, over a few thousand miles after the adjustment, I noticed that 5–7 mins after driving on a cold engine that’s warmed up, the car will buck at around 2k rpm. I just thought maybe my friend messed up on an intake valve...this sensation of bucking or Rpm suddenly dropping slightly and slight bucking is especially evident when the a/c compressor is on.
i had a small pull against a friend a few weeks back, 244k, and the next day my CEL was on. I got it checked and it was fuel related. Said something about running rich. However, the light turned off by itself in 30-40 miles of driving and turning the car off.
Considered my self lucky.
well, more recently, a day ago, I noticed my car running a bit odd during steady speed and rpm. So at 55 mph and 1850-1900 rpm, I’ll feel that the engine is losing power VERY SLIGHTLY, but it comes back. Some sort of hesitation...the loss of power results in just 50-80 rpm loss but returns
Today I got a CEL again, and I just kept driving around. I turned the car off, came back a few hours later and was going home and noticed the CEL light was off again. But on the way home it kept doing the hesitation thing once or twice until I turned the ac off.
not sure if I need new fuel injectors... we’ve replaced a coil pack that was bad 15-20k miles ago n the rest fired fine so I know it’s not a spark issue. Especially since we replaced the plugs during valve lash adjustment with ngk.
i admit sometimes I run really low on gas n not too long ago my car nearly died because I forgot my money at home. So not sure if I messed up an injector.
i use only 93 octane and run fuel injector cleaner,(lucas) and seafoam thru there very often.
Last edited by Angrybear; Jul 27, 2019 at 10:29 PM.
I agree, it's hard to diagnose the fuel injectors if it's not throwing a symptom...
it's hard to diagnose the fuel pump if it's not throwing a symptom....
if the car is running rich, perhaps it an 02 sensor
it's hard to diagnose the fuel pump if it's not throwing a symptom....
if the car is running rich, perhaps it an 02 sensor
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