2002 running rough at idle

2002 running rough at idle

Postby scott936 [OP] » April 12th 2011, 3:17am

OK, new plugs, wires, cap rotor, throwing no codes. Van runs rough at idle with foot on brake and in gear,I have checked for vac leaks none found. Any Ideas????
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Re: 2002 running rough at idle

Postby throrope » April 12th 2011, 4:04am

I had that bad for years until recently. It would throw a knock code until warmed. EGR valve was gone. Now better, but I'm thinking I still have another itch. Manual sez a temp sensor out of range can cause that too. After five bucks on line, it's sitting next to the keyboard.
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Re: 2002 running rough at idle

Postby scott936 [OP] » April 12th 2011, 10:50am

There are so many things it could be, O2, maf, egr - just a guessing game till it throwes a code
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Re: 2002 running rough at idle

Postby chevymaherchevymaher is online! » April 12th 2011, 11:53am

Its just a personal opinion but I think the factory 500-600 idle is to low.The better mine runs the lower it seems to idle.with a slight vacuum leak it idled smoother.life would have been so much simpler if they had not sealed the idle screw.I am not asking much 750 rpm just a little faster than the starter spins it LOL 500 rpm any cough at all and what 400 rpm that enough to make any thing idle rough i can hear the motor now in its little sarcastic voice.Hey chief how about I spin backwards for ya would that be slow enough.
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Re: 2002 running rough at idle

Postby scott936 [OP] » April 12th 2011, 12:28pm

chevymaher wrote:Its just a personal opinion but I think the factory 500-600 idle is to low.The better mine runs the lower it seems to idle.with a slight vacuum leak it idled smoother.life would have been so much simpler if they had not sealed the idle screw.I am not asking much 750 rpm just a little faster than the starter spins it LOL 500 rpm any cough at all and what 400 rpm that enough to make any thing idle rough i can hear the motor now in its little sarcastic voice.Hey chief how about I spin backwards for ya would that be slow enough.


I need to put attach on it to see what the rpms are at when idleing..... maybe its running back wards :rofl:
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Re: 2002 running rough at idle

Postby scott936 [OP] » April 12th 2011, 12:32pm

today I will replace the fuel filter to eliminate that possible cause.... then go from there
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Re: 2002 running rough at idle

Postby Woodweasel » April 12th 2011, 3:17pm

Try your Idle air control valve.
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Re: 2002 running rough at idle

Postby scott936 [OP] » April 13th 2011, 12:06am

Woodweasel wrote:Try your Idle air control valve.


Would the IAC cause the problem to worsen when AC is on and in gear? Today it started stalling when I was backing out of the garage.
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Re: 2002 running rough at idle

Postby chevymaherchevymaher is online! » April 13th 2011, 12:20am

scott936 wrote:
Woodweasel wrote:Try your Idle air control valve.


Would the IAC cause the problem to worsen when AC is on and in gear? Today it started stalling when I was backing out of the garage.

yes it would.It supposed to idle it up for both.When I put it in reverse you can hear it rev a second before it completely in gear.
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Re: 2002 running rough at idle

Postby scott936 [OP] » April 13th 2011, 1:27am

chevymaher wrote:
scott936 wrote:
Woodweasel wrote:Try your Idle air control valve.


Would the IAC cause the problem to worsen when AC is on and in gear? Today it started stalling when I was backing out of the garage.

yes it would.It supposed to idle it up for both.When I put it in reverse you can hear it rev a second before it completely in gear.


Odds are that's the problem, I will go by my parts house and run a check on her see if any codes come up, IAC is $123.00 sound about right?
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Re: 2002 running rough at idle

Postby chevymaherchevymaher is online! » April 13th 2011, 1:32am

scott936 wrote:
Odds are that's the problem, I will go by my parts house and run a check on her see if any codes come up, IAC is $123.00 sound about right?

113 bucks for a ac delco one here at the joint I get mine at.Wow the newer vans more it 67 bucks for my year.
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Re: 2002 running rough at idle

Postby scott936 [OP] » April 13th 2011, 2:05am

The fun never stops... Check out my post in exteriors
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Re: 2002 running rough at idle

Postby scott936 [OP] » April 13th 2011, 6:02pm

Ran codes.... None...???? Replaced the fuel filter no effect on the idle issue. I hate to throw parts at it till something sticks but I'm at a loss right now :banghead:
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Re: 2002 running rough at idle

Postby chevymaherchevymaher is online! » April 13th 2011, 6:20pm

scott936 wrote:Ran codes.... None...???? Replaced the fuel filter no effect on the idle issue. I hate to throw parts at it till something sticks but I'm at a loss right now :banghead:

Did you check idle RPM with tach.Then put it in gear see what it doing?
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Re: 2002 running rough at idle

Postby scott936 [OP] » April 13th 2011, 10:26pm

chevymaher wrote:
scott936 wrote:Ran codes.... None...???? Replaced the fuel filter no effect on the idle issue. I hate to throw parts at it till something sticks but I'm at a loss right now :banghead:

Did you check idle RPM with tach.Then put it in gear see what it doing?


no not yet, bigger problems came up today the required immediate attention.... Front left tire and right rear found some safety issues that forced me to get a new set... Problem being I have a requirement for weight capacity so trying to find tires that are load range C and that fit is not easy. I ended up with Cooper HT Extra load, its not a true class C but its better then a P metric, had to jump up to 235/75/15. They will be here tomorrow, riding on a doughnut now how sexy is that... :lol:
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Re: 2002 running rough at idle

Postby NY Safari TONKA » April 14th 2011, 6:07am

Try this chk all your sparkplug wires and make sure that the metalic contact to the Cap plus to the plugs are nice and thight...not by suction of insulation :banana:
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Re: 2002 running rough at idle

Postby scott936 [OP] » April 14th 2011, 10:35am

NY Safari TONKA wrote:Try this chk all your sparkplug wires and make sure that the metalic contact to the Cap plus to the plugs are nice and thight...not by suction of insulation :banana:


I will check that this afternoon, thanks
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Re: 2002 running rough at idle

Postby scott936 [OP] » April 14th 2011, 8:05pm

Im using a friends (Shop) a reader to see if I can pick up any codes as I drive.... So far nothing.
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Re: 2002 running rough at idle

Postby scott936 [OP] » June 8th 2011, 3:21am

Well the van never threw a code so i decided to start throwing parts at it. I replace the IAC, TPS and coil, its runs better but still has a bad idle issue so next I will play with the timing and see what I get :confused:
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Re: 2002 running rough at idle

Postby scott936 [OP] » June 11th 2011, 3:17pm

OK today is the day to start playing with timing. I installed a spacer today for the TBI so we'll see if that does any good on Wednesday, that my long trip day
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