RT
Bronco Guru
- Joined
- Sep 29, 2003
- Messages
- 1,034
I've been chaseing down a fast idle / surge condition this week . I run a 92 Mustang EFI /A9L comp.
When I ran codes , nothing unusual came up even though the check engine light would come on occasionally.
But the surge and light never came on together . After swapping out spare tps, setting the voltage (.98 ) , aic ? , and messin' with the mass air sensor it came to me that the problem would only happen after the engine warmed up completely.
As it was idleing , the idle would surge off and on . When it surged I pulled the lead off the coolant sensor, and the idle dropped , put it back on , up it went .
I left the lead off as I drove to the parts store , got a new one , put it in right there and drove home with out any surge !!
Re-set the idle ,Re-checked the tsp voltage , pulled the ground off the battery for 1/2hr or so and was good to go .
Drove it around today , no light , no surge !!! It made people nervous at crosswalks when the idle would creep up to 1100 rpm or so ;D
The check engine light has been coming on for a second or two ocassionally for about a year now , but nothing showed up when I ran the codes. The fast idle just started this week
Hope this helps someone that may have the same problem
Now where ,,,,
where'd I put that Tequila ,,,
When I ran codes , nothing unusual came up even though the check engine light would come on occasionally.
But the surge and light never came on together . After swapping out spare tps, setting the voltage (.98 ) , aic ? , and messin' with the mass air sensor it came to me that the problem would only happen after the engine warmed up completely.
As it was idleing , the idle would surge off and on . When it surged I pulled the lead off the coolant sensor, and the idle dropped , put it back on , up it went .
I left the lead off as I drove to the parts store , got a new one , put it in right there and drove home with out any surge !!
Re-set the idle ,Re-checked the tsp voltage , pulled the ground off the battery for 1/2hr or so and was good to go .
Drove it around today , no light , no surge !!! It made people nervous at crosswalks when the idle would creep up to 1100 rpm or so ;D
The check engine light has been coming on for a second or two ocassionally for about a year now , but nothing showed up when I ran the codes. The fast idle just started this week
Hope this helps someone that may have the same problem
Now where ,,,,
where'd I put that Tequila ,,,
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