Mine Romped only when the oil started to get old (~3000 miles) and it was below freezing the first start in the AM. That's when I start plugging it in (and getting an oil change)


Dave.

 

i am real stickler about my oil changes... wonder if 15w 40 is not the right mix, but being synthetic, I dont know.....

 

Just curious.. what brand of syn oil and what weight have you been using.. I used Delo 400 since the truck was new and it always had the romp romp at start up.. but last year i switched to Shell Rotella syn 5w40 and it has never romp since.. (romping meaning the engine is changing rpm quickly from to almost normal rpm to almost dieing..this repeating back and forth..until the oil warms up abit and the injectors start working normally).
I agree with "Just Another Truck" above.. I also think 15-40 is not right for our engines, especially in the colder climates..

 

There seems to be too much confusion about what romp is. For me, it is the engine barely fires, about dies, barely fires again, about dies. It may romp once or twice or more and in really cold situations it rocks the whole truck. This is very different from a fluctuating idle, and goes away fairly quick but is very annoying and loud.

 

I think you explained alittle than me.. But yes, this is what I call romp..

 

That sounds to me like something is not building pressure fast enough; HPOP oil pressure or fuel pressure.
Since the fuel pump is running the whole time the WTS light is on, I'm thinking your HPOP is taking it's sweet time to build pressure.

 

Funniest thing, I read this post on friday imagining what a romp is, and this morning my truck romps on start up. I've got new 15w40 rotella and the temp was 0C (that's 20F I think). I should have used 5w40 I guess, but will fixing the ipr work too? worth a try?

 

I would say it is definately worth a try switching to synthetic. Mine did romp with Rotella but does it more now with the Delo??? I need to make a point of logging my ICP and IPR when cold starting but I am usually going hunting and do not have time. I know the reservior is full so my next step is a datalog and maybe a switch to synthetic. My problem is that it simply is not cold enough here right now for that kind of romping with the 15-40.

 

My 99 would romp in the morning after backing out of the garage in mild weather until I switch to Rotella Syn over a year ago.. No problem since.

 

I hear what you are saying Dan, but the bottom line is that there is no HPO pressure until you turn the key to crank it. So, either my IPR is not building it or the ICP is faulty because 40*F is not cold enough for relatively fresh 15-40 to not be up to the task. Of course I know my HPO reservoir is within specs. I will figure this out this year.

 

Well, its almost ski season here and I'll see how mine does. I may have to do an early oil change 1/2 way through the season and see if that improves things. I just hope I don't have trouble starting when it gets colder.

 

I still use Amsoil..
Tenn, when you gave your description, it sound identical to what I am saying, but i havent noticed anyone else mention this, I am in gear when this happens, I am at idile, but it in gear. It is normally three Romps and off i go.

 

I have the same romp, even in the summer. If I leave the block heater plugged in, no problems. I occasionally get the SES light flashing (on for 1/4 of a second kind of thing) and then back off. When I check the codes, it is the ICP too high/low. I am going to try the orings on the IPR, and then will try starting it without the block heater. I will keep everyone posted.

 

I have the same romp, even in the summer. If I leave the block heater plugged in, no problems. I occasionally get the SES light flashing (on for 1/4 of a second kind of thing) and then back off. When I check the codes, it is the ICP too high/low. I am going to try the orings on the IPR, and then will try starting it without the block heater. I will keep everyone posted.