Help idle fluctuates when cold

[RottnDogue]

Friends 95 is Fluctuating Over 200 rpm's up and down @ idle during cold start ups. Any thoughts on what it could be?? It lasts for about 2 mins tops then smoothes out. Any thoughts would be appreciated.



Darren

 

[illflem]

His grid heater is probably cycling on and off causing a load on a engine that is idling too low. If it is an auto the idle should be set to 700 in drive with the AC on.

 

[redneckdr]

fluctuation

yep. prolly the grid heaters cycling. when they come on, adds load to the alternator, thus the drop in rpm.

 

[Rnpeder]

How do you adjust the low idle? My truck is doing the same thing. Has always dimmed the lights, but never changed the idle.

 

[Extreme1]

Look at the linkage at the back of the pump. There is a 10mm bolt (head) and lock nut. Loosen the lock nut and adjust the bolt.

 

[Deezul1]

Watch the voltmeter and the tach and see if they both drop at the same time, if so its grid heaters

 

[RottnDogue]

Thanks everyone, I will let him know that it's probably his grid heater and make sure he doesn't have anyother symtoms



Darren