Start-up idle issues driving me crazy
#11
Join Date: Jul 2009
Location: Near NY for another contract
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Always replace with new ones or, you can have someone make you a set of Al ones for less than what it costs to buy new OEM. I would avoid junkyard fuel rails as well. Reason being is that they have been sitting without gas in them for God knows how long and, the insides are probably corroded worse than yours.
Get new ones.
#12
Join Date: Jul 2009
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I believe iac is on tb and all of those sensors were replaced and i soaked all the parts in a bucket of gas one night and in a parts cleaning tank the night before that didn't really see any rust in the fuel lines but I didn't look until after they soaked and I flushed them so I'll take them back apart, if that is the problem should I replace the rails and is there a good place to buy them?
You can get a new set here:https://www.dodgetruckparts.net/dodge-parts-search.html
The only other option is to have custom rails made. If your interested in this route just let me know. CM
#15
have you checked for a vacuum leak?...a bad enough leak can cause rough idle and possibly a stall. Use an unlite propane canister (like the one used on camping grills) and hold it next to all the vac lines (esp the one to the brake booster), if you hear a surge in throttle while doing this, you found your leak.
EDIT: vac leak wouldn't go away after 5min of driving...that's what I get for speed reading.
EDIT: vac leak wouldn't go away after 5min of driving...that's what I get for speed reading.
Last edited by RamMan4x4; 08-26-2009 at 05:27 PM.
#16
I have the plastic fuel rails on mine and I'm sure you do too Laramie, but I have often wondered if they are plastic all the way through or just plastic coated aluminum? I have trouble believing that the plastic would hold up to 13 years of pressurized gas going through them and the heat of the engine bay without them giving out. Mine don't have the pressure connector unfortunately. Can't test fuel pressure if I ever need to.
#17
Just a thought I had could an 02 sensor cause this problem when I got the duals put on I drove it about 45 min the no pipes and the sensors wire tied behind the manifolds so they didn't scrape, it did this before but it seems to be much worse now, it's also been a little colder so I don't know if this would affect it at all.
#18
I have the plastic fuel rails on mine and I'm sure you do too Laramie, but I have often wondered if they are plastic all the way through or just plastic coated aluminum? I have trouble believing that the plastic would hold up to 13 years of pressurized gas going through them and the heat of the engine bay without them giving out. Mine don't have the pressure connector unfortunately. Can't test fuel pressure if I ever need to.
#19
Join Date: Jul 2009
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I have the plastic fuel rails on mine and I'm sure you do too Laramie, but I have often wondered if they are plastic all the way through or just plastic coated aluminum? I have trouble believing that the plastic would hold up to 13 years of pressurized gas going through them and the heat of the engine bay without them giving out. Mine don't have the pressure connector unfortunately. Can't test fuel pressure if I ever need to.
What is the material that composite fuel rails are made out of? It has to be both fuel and heat resistant as well as meeting burst tests and burn tests, UV tests, temp cycling tests, mechanical shock and vibration tests, salt tests and more.
If someone knows what these "plastic" fuel rails are made out of please post it here. I am very curious to read what the material is as I have never seen plastic fuel rails before nor heard of plastic fuel rails. Just curious that's all.
The coating on the metal fuel rails is a powder coated type of coating. It is not very thick either. The MIL thickness on that looks very thin on mine. It has to be thin so that the I.D. and O.D. are not grossly affected by paint thickness and go out of tolerance.
#20