PMS..Need help with idle
- Thread starter blackcloud50
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See the sticky "Help me create the Surging Idle Checklist" at the top of the forum for help with your idle problems. The first post has all the updated answers. I add to the first post as new fixes and suggestions are posted.
Hey i had the same problem when i bought my car, i had a surging idle and would idle high befor going back to 850 rmps. I replaced the Idle air control valve, that stoped the surging, then after playing with the timing i got it to respond better. Believe it or not after disconecting the battery and letting the car sit for a half hour. It ran perfict! hope this helps...
88_GT_5_oh
Sportin' a turbo 5.0 in Canadistan
i had the same problem on my turbo stang.
do this and it will be solved
1. The car must be at operating temps. If you can't keep it idling, drive it until it reaches full water temp.
2. Turn ON the headlights.
3. Turn OFF any accessories, like a/c, heater, defrost.
4. Unplug the IAC connector. The IAC is the small cylinder attached to the throttle body.
Note: If you unplug the IAC and the engine stalls, then you know the TB was not open enough causing an over rich condition. Leave everything as is, just open-up the throttle screw a bunch so that the engine can breathe while you set the idle rpm. Restart the car, and continue with #5 below:
5. Adjust the throttle stop screw until you have the idle rpm you desire. then shut the car off and reset your TPS
6. Plug the IAC connector back in.
Make sure the TPS is right
The TPS is another issue. Generally, you want to try and get it as close to 0.97-0.98 at idle as possible. Make sure that when you open the throttle all the way it hits 4.60 volts. Now, with the advent of the 04 PMS, you can "fudge" with those numbers. If you cannot get the TPS to read under 1.00, for example, you can set the PMS to tell the EEC it is seeing idle at 1.01. You should always try to get the idle reading below 0.99, but if you cannot, then this feature is really useful. The same is true for WOT, you can use the TPS option in the PMS to set the WOT tps voltage. Say you cannot get it to read 4.6, or you want earlier WOT tuning to take effect. Then you can set the WOT to say, 4.0 volts at 30% error. There are more detailed threads on this.
do this and it will be solved
1. The car must be at operating temps. If you can't keep it idling, drive it until it reaches full water temp.
2. Turn ON the headlights.
3. Turn OFF any accessories, like a/c, heater, defrost.
4. Unplug the IAC connector. The IAC is the small cylinder attached to the throttle body.
Note: If you unplug the IAC and the engine stalls, then you know the TB was not open enough causing an over rich condition. Leave everything as is, just open-up the throttle screw a bunch so that the engine can breathe while you set the idle rpm. Restart the car, and continue with #5 below:
5. Adjust the throttle stop screw until you have the idle rpm you desire. then shut the car off and reset your TPS
6. Plug the IAC connector back in.
Make sure the TPS is right
The TPS is another issue. Generally, you want to try and get it as close to 0.97-0.98 at idle as possible. Make sure that when you open the throttle all the way it hits 4.60 volts. Now, with the advent of the 04 PMS, you can "fudge" with those numbers. If you cannot get the TPS to read under 1.00, for example, you can set the PMS to tell the EEC it is seeing idle at 1.01. You should always try to get the idle reading below 0.99, but if you cannot, then this feature is really useful. The same is true for WOT, you can use the TPS option in the PMS to set the WOT tps voltage. Say you cannot get it to read 4.6, or you want earlier WOT tuning to take effect. Then you can set the WOT to say, 4.0 volts at 30% error. There are more detailed threads on this.
88_GT_5_oh
Sportin' a turbo 5.0 in Canadistan
did you try and turn the idle control on in the PMS? whats your combo? did you reset your TPS after you re-adjusted the throttle blade? does the screen on your PMS say "idle". when you step on the gas with the car off does the screen say WOT? put a voltmeter on the TPS and slowly open the trottle by hand and make sure the TPS signal slowly rises with the throttle till it hits ~4.60 volts
88_GT_5_oh said:
Yes to all. My combo is a 306 with Vortech, H,C,I.
To fix my initial issue I have turned idle control on but from a cold start up it idles at like 1400 for about a minute, then drops and fluctuates between 1100 and 1250 for the rest of the time until my ECT temp reaches exactly 180..then it finally drops to 900 rpms.
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