ruff idle still

epowers777 · #1 Mon, April 18th, 2011, 05:42 AM

Well my truck is still idling ruff. I got a new under the valve cover harness and tried a new icm and im still having ruff idle. When I start the truck up cold it idles perfect. Is there a way to adjust the tunes so it idles like that all the time? When it gets warm is when it idles bad.
99 F350 DUALLY 4*4
STAGE 2 SINGLE SHOT injectors by Rosewood
Magnum intake
whissling wheel
exhaust
Guages
rebuilt fuel bowl
New ip sensor
New valve thingy on hpop pump
New alternator
I have the fu chip with custom tunes. Please help I have had nothing but issues with these single shot injectors.
also my dad was following me and said when I let go of the gas it blows a puff of white smoke.

rammertide07 · #2 Tue, April 19th, 2011, 12:32 PM

Just guessing, blown injector gasket, bent push rod, valves not seating all the way. My uncle said he has a blown injector gasket because of all the gunk built up around that injector. Any truth to that...

I think I have the same issue (minus the white smoke) and I JUST replaced the cps with the black one from riff raff. I'll see how it runs when I leave work. It did stumble under light acceleration, but pulls very good under firm acceleration. So just in case I'm doing pricing for rocker arms, push rods, and valve springs.

My uncles 99 F250 did puff out clouds of white smoke under normal accleration but would clear up if he got on it. Then he went to start it one day and you could hear a open vlave. He pulled the valve covers and a push rod (or half a pushrod) was laying on top. After he replaced that one, another one broke and a rocker arm. So he just replaced every one of 'em.

Try running some tests on the engine and see if you get any codes...that'd be a good place to start.

epowers777 · #3 Mon, April 25th, 2011, 12:36 AM

Does anyone have a video of a 7.3 idling with air in the fuel lines? Im wondering if i have a leak in the fuel line and thats why it idles funny. Just a guess. I did the fuel tank mod and it has a inline filter.

rammertide07 · #4 Mon, April 25th, 2011, 10:57 AM

After I installed a new black cps my truck ran much better, but now its back to its old ways...stumbling on accleration and a miss at idle. I unpugged my ICP yesterday and the miss at idle was even more noticeable. So I'm thinking IPR or IDM. Have you tried letting it idle with the ICP unplugged? Maybe we have a related problem.

I'm buying AE from PHP next month and hoping it can help me find the issue.

epowers777 · #5 Fri, July 15th, 2011, 07:04 PM

Ok finally pulled my injector Rosewood diesel will inspect my injector even though my warranty is up. While everything is open what do I need to look for. What am I looking for in the cups etc. I started the truck up with the valve covers off and there was good blowby that I could see. What is expectable etc. Anyone have a video?

***cleatus12r*** · #6 Fri, July 15th, 2011, 08:50 PM

Acceptable is when you can remove the oil fill cap and you don't see individual "puffs" of crankcase vapors.

The pressure of the vapors should not be enough to lift the cap off of the filler tube when placed upside down. It may vibrate off of the filler tube, but it shouldn't be blown off.

epowers777 · #7 Fri, July 15th, 2011, 10:15 PM

Ok then its fine what am I looking for in the injector holes?

I spoke to Rosewood he thinks its the tuning but will check the injectors for me

rammertide07 · #8 Mon, July 18th, 2011, 07:09 AM

And what is there is enough pressure to lift the cap? I was at the dealer a couple of months ago to do the brake sensor recall and I asked him (the diesel tech) about my idle. He said it was from cylinder wear due to a "bad" filter (AFE). He then pulled my oil fill cap off and showed me the crank case vapors...it looked enough to lift the cap but I haven't tried..yet.

***Power Hungry*** · #9 Mon, July 18th, 2011, 12:19 PM

There is ALWAYS going to be some amount of blowby. That's what PCV and Crankcase Vents are for. The concern is not necessarily how much blowby you are getting (of course there can be too much), but whether or not it is a smooth stream (like blowing through a straw) or coming out in puffs (like making a motorboat sound with your lips). Uneven blowby indicates unusual wear (or worse, piston/ring damage) on a particular cylinder. This would also be evidenced by a compression test, but this is the poor man's way to identify possible engine problems.

rammertide07 · #10 Mon, July 18th, 2011, 07:02 PM

That's my kind of diagnoses

My blowby was even. I always thought the idle of a 7.3 with a good bit of cylinder wear would be like my 96 250k with 650k mi. It idles up and down in a uniform fashion. My truck now has a random hick-up...mainly after its warm. I've read where a lot of other guys on the forums saying they fixed the same issue by finding and fixing bad injectors o-rings. And unless it becomes a must to fix, I'm gonna wait it out until I replace the injectors.

Thanks Bill, good to hear you