lope / miss at startup please help
#1
07-07-2007, 06:55 PM
lope / miss at startup please help
I have a 99 sts that when you start it it chugs or misses until you bring the idle up, I have replaced the idle air control valve with no change, this car has 80 k miles with excellent care, the car runs fine after the intial start up ..all help and ideas would be extra helpful...thanks Mike
#3
07-07-2007, 08:05 PM
RE: lope / miss at startup please help
I would check the fuel pressure regulator.
Very common for the symptom you are describing.
Pull the vac hose of the regulator and start the engine.
If fuel is in the line or it spews out when you start it then it's no good.
Sometimes i need to put a hand vac pump with a clear hose on the regulator to see if fuel is getting by the diaphragm.
Very common for the symptom you are describing.
Pull the vac hose of the regulator and start the engine.
If fuel is in the line or it spews out when you start it then it's no good.
Sometimes i need to put a hand vac pump with a clear hose on the regulator to see if fuel is getting by the diaphragm.
#5
07-08-2007, 06:38 PM
RE: lope / miss at startup please help
Does it do it every time you restart the car?
Does it act up more when its hot? cold?
You say the regulator is fine and fuel pressure is good.
Did you check residual pressure after 10 minutes?
You really give us very little info to work with.
Does it act up more when its hot? cold?
You say the regulator is fine and fuel pressure is good.
Did you check residual pressure after 10 minutes?
You really give us very little info to work with.
#6
07-14-2007, 02:43 AM
RE: lope / miss at startup please help
I replaced the regulator, it does it warm or cold, worse when its cold like its loading up , I can throttle up at start up and it will clear it self then run fine, I have not checked residual pressure, are you talking fuel pump bleed back? this car has 80k on it..thanks Mike
#8
07-14-2007, 05:10 AM
RE: lope / miss at startup please help
You might be getting coolant in a cylinder or two.
I would pull the plugs and look them over closely.
See if you can narrow it down to one or more cylinders.
I would pull the plugs and look them over closely.
See if you can narrow it down to one or more cylinders.
#10
07-15-2007, 05:33 PM
RE: lope / miss at startup please help
https://www.cadillacforum.com/m_9792/tm.htm
The REQUEST from us?
Here are some guidelines that might make things smoother for both you and us.
None of this is mandatory. It is a request, so that we can help each other.
#1.
State the problem in its completness and correctness, the car model and year, etc.
#2.
Tell us when the problem occurs: driving, starting, parking, cold weather, hot weather,
when your aunt drives it, when it rains, when the planets are in line, etc .. you get the point?
#3.
PLEASE TELL US what you have done so far in trying to resolve the problem. IF nothing, say that.
I cannot think of anything more frustrating than we start making suggestions and we get a "done that."
Me for one, usually take a deep breath and dont come back to that thread when that happens.
Other TECHs may be more forgiving.
Here are some guidelines that might make things smoother for both you and us.
None of this is mandatory. It is a request, so that we can help each other.
#1.
State the problem in its completness and correctness, the car model and year, etc.
#2.
Tell us when the problem occurs: driving, starting, parking, cold weather, hot weather,
when your aunt drives it, when it rains, when the planets are in line, etc .. you get the point?
#3.
PLEASE TELL US what you have done so far in trying to resolve the problem. IF nothing, say that.
I cannot think of anything more frustrating than we start making suggestions and we get a "done that."
Me for one, usually take a deep breath and dont come back to that thread when that happens.
Other TECHs may be more forgiving.