ST 01 cold idle problem

[Bob Morse]

When the outside weather is cool or cold the enginge stuters and tries to die unless you keep the rpm above 1000 for a few min then it idles fine. if it idles to low the engine dies and sets error code 171 and 174. Clearing these codes from the computer clears the CEL until the rpm drops on a cool morn and the engine dies again. On warm days or afternoon starts the engine does not do this. It may idle low or rough for a few seconds then the ECU speds it up and it is fine. Problem only shows on cool or below mornings. Again clearing the codes keep them clear untill a repeat. Codes have remained clear for 6 weeks and no problems untill I forgot to keep engine running faster on cool morning for a few min. Any suggestions on this.

 

[Bill Ellis]

Might be that IAC valve needs to be cleaned. Another possibility may be MAF sensor or it could be something else like the infamous cracked hose elbow. Try elbow first then clean IAC anyway, thay can usually use some cleanup every so often.

 

[Bob Morse]

Have looked for the elbow but where it is supposed to be is a rigid plastic hose on the 2001.

 

[Tom Schindler]

2001 Job 1. Intake manifold gasket.





Tom