Idle Surge

[Diesel_Fry]

Ok people.....help a newbie out here (please LOL)

Been looking at an '03 PSD, 6.0 with 40,000 miles on it. I really like the truck, but have heard horror stories about the 6.0. The truck I test drove was really nice. The only thing I noticed was that when I was walking around the truck and it was at an idle the motor kind surged a few hundred RPM's and than went back to a normal idle. This happend a few times then I drove it. The truck didn't do it when I had it going down the road or at a stop.

Is this nromal?

Fry

[stump0331]

was it cold outside?

[DKR]

If the weathers cold..and it is in park w/ the parking brake on...the computer now automatically bumps the RPMs up to 1000 to help alleviate wetstacking....mine does it in the morning usually when it is colder out

[Diesel_Fry]

It was cold outside and snowing pretty good too. I dont remember my '97 7.3 ever doing this though. I do understand , however, this is a different engine. Well, off to look at one more truck tomorrow. Same year and same engine as the one I drove the other day. I sure could have used a truck this week. Gettin pounded with snow!!

Thanks!!
Fry

[stump0331]

the park brake doesnt have to be on mine , but its a smaller version of high idle helps the truck warm up

[03-6.0PSD]

mine jumps to 1000 when cold outside, with out the PB on.
and with out the key. (remote start)

[DKR]

Originally Posted by stump0331

the park brake doesnt have to be on mine , but its a smaller version of high idle helps the truck warm up

Originally Posted by 03-6.0PSD

mine jumps to 1000 when cold outside, with out the PB on.
and with out the key. (remote start)

OK..maybe it doesn't need the PB ..I just never really payed that close attention...I thought the manual said something...oh well...I know for the factory high idle on a switch (then one that bumps to 1200 RPMs) one of the conditions has to be PB set...guess the normal "cold idle up" doesn't need it

[03-6.0PSD]

Well I noticed an Idle surge in my truck a few days agos, after driving sometimes, when you park and let it idle, and watch the tach, the needle jumps about 50-100 rpm then falls back to idle and does this intill you start driving again. its very random, and doesnt do it all the time.

Possibly a dirty EGR Valve?

[sootyoil]

Originally Posted by 03-6.0PSD

Well I noticed an Idle surge in my truck a few days agos, after driving sometimes, when you park and let it idle, and watch the tach, the needle jumps about 50-100 rpm then falls back to idle and does this intill you start driving again. its very random, and doesnt do it all the time.

Possibly a dirty EGR Valve?

I would bet money the type of oil causes those issues with any engine during cold starts. a clogged egr would also be affected by poor quality oil. find someone who has 5w30 heavy duty diesel oil with a pour point of -60 F instead of the popular Rotella 15w40 -15 F pour point that is naturally much harder to be pumped throughout the engine during cold startup. cold start causes most engine wear in all engines and many other issues common with popular low quality diesel oils...

[03-6.0PSD]

It is not during start up, but only after you have been driving around for quite sometime. The truck is certainly Warmed up when it starts surging, and its only by 50 -100 RPM.

The truck runs fine on cold starts, and it always gets a warm up.