still chasing cold idle symptoms.

[ed hess]

After doing all the following I’m stumped
changed
iac
egr
map
ign module
coil
cap
rotor
plugs and wires
temp sensor
o2 sensor
vac lines seem tite with tire tube test
fp 50 then 45 nothinn
I probably tried other shit but im too pissed writin this to remember.

dm aint helpin me find it either all I see are the symptoms due to experience.
It’s a shame we don’t have a section here with files for what happens when this sensor is bad, or a bad plug, a vac leak etc. take a good truck, swapin a known bad item, record it and then post the file. Sure would end a lot of frustration.

Starts to sputter 3 times in a row during the 1st minutes and will want to stall going into gear until its good and warm. Then it runs fine. I do notice that the crosscounts don’t move much till it gets warmed up. But this is the same as the one dm file I got from hurydes posted dm file.

Pcv’s are correct with e stamped on them.
I didn’t change pickup coil.

What is the stuff to spray on it to check if rpms go up if vacumn sucks it in????.

Even though It didn’t leak under pressure with bike tube? Im thinking maybe there is a leak only under vac and not under pressure.

I even plugged cannister and crusie control line to eliminate those diaphraims for testing only. Check valves are all correct direction.

I know its somethin small and I could live with it but its getting personal in my own mind.
ed

did this with stock chip and 2 bar, although i waited till after 3 bar and ultimate to eliminate those 2 items as the culprit.

 

[Maverick87]

carb cleaner I think its time to change the tires. LIke pull the tires of and pull a different truck between them. mite fix the problem. :lol:

 

[Rick Krupa]

Ed,

Sounds like you and I are chasing the same gremlin. My ty has always idled real good since '94 but for the past 6-months or so after letting it sit overnight, on startup it idles up + down and wants to die for 2-3 minutes then clears up and will idle like a Caddy all day even with the air on until the next morning. I have replaced just about all the items you mentioned including Walbro a few years ago, stock chip with fuel press. set at 46psi with vacuum line disconnected. Plugs were replaced with NGK-UR5 some months ago also. I also replaced the upper intake gasket and the complete throttle body gaskets and cleaned them out when I had them off this past year while I had them polished. Didn't notice anything unusual on DM. It idles real bad when I get to the first two stop lights in the morning and then clears right up but is still frustrating. I think I'll try spraying some carb cleaner to see if there are any leaks but even if there was I would think it would idle bad all the time.

 

[ed hess]

what else did you try.
Since it seems heat related i wonder about electrical like the pickup coil. my manual doesnt tell me how to change pickup coil so i dont know if distributor has to come out.

Carb cleaner sittin on desk till i get time. Going to set laptop up next to fender so i can watch dm as i do it.

ed

 

[Rick Krupa]

I have changed just about all that was listed above. I haven't changed the pickup coil but had the ignition module and coil replaced in May for a intermittent no start I was experiencing which solved that problem.

 

[Rick Krupa]

Just thought of some other things which were replaced this past year. Powermaster 140amp alternator, wastegate solenoid, EGR valve + solenoid

 

[LIVEEZ]

It sounds like there are a lot of us in the crappy idle boat. I have the same problem. I have replaced my distributor with a new MSD distributor. I was going to replace the pick up coil but I found one of the magnets was broken. Unfortunately the new distributor did not fix my idle problem. I was going to start replacing all of the items you guys have, but maybe I will go another direction.

check list of other things that could cause cold rough idle:

lower intake gasket?
a bad lifter that is pumping down over night?
fuel injector?
Fuel injector O rings?

????I don't know
So I live with it for now, and I put fewer miles on because of it. It is a little embarassing, a mechanic riding in a nice truck that always sounds like it will stall any minute at the traffic lights.

 

[ed hess]

but this goes away when you are at full operating temperature.
hey dont feel bad, Im 45 and been in the car business my whole life. 1st tool box i was only 12. We're gonna find this sucker!
ed

 

[SY756]

Ed,
As far as the pickup coil, I replaced mine about 3 months ago. It's not hard at all. But yes, you do have to take out the distributor.

 

[ed hess]

were the symptoms the same?
did it solve the problem?

 

[SY756]

My symptoms were a little different. I had a slight erractic miss at idle hot or cold. I can't say 100% that it cured the problem because I burned and put in a leaner chip at idle/low end at the same time. I will say that my pickup coil was in much need of replacing, extremely corroded. It's really not that bad of a job and if the dist shaft doesn't have any play in it, it's ALOT cheaper than a new distributor.
Good Luck

 

[Rick Krupa]

Some other things I have done was try 160,180 +195 Thermostats this past month. Still the same. Left the 160 in. Also had all the fuel injectors removed and professionally cleaned and flow tested but that was a couple of years ago. I'm starting to wonder if the cold idle problem started when I changed plugs to the NGK-UR5 some months ago or my throttle body being that this is not the original. The one I have now was being polished and then made sure it was real clean and all new gaskets installed. I tryed spraying Carb cleaner or it was fuel injector cleaner which I had on hand yesterday all over the engine and didn't notice any leaks. Keep in mind folks this is only a problem when cold like starting for the first time in the morning and only lasts for 2-3 minutes with a rough idle and wants to die, then it purrs like a kitten all day.

BTW Ed, I'm 45 years old also so maybe it has something to do with us old guys and rough idle Hey?

 

[ed hess]

yeah its syclonealzheimer idle defiincey system. probably a cure listed on the cdc website. Being in the car business is a iritant to the problem as it aggravates it when you dont have time for little nuances from the truck cus your trying to run a business. Its analogous to an employee that doesnt operate at optimum efficiency. It works sometimes and other times it doesnt but not enough to piss ya off to get rid of em.

I dont think its timing as dm shows the same 23.2 advace at idle as the sample files dm software came with.

I bought a tdc checking tool ive yet to use.

I put a deposit down on that 4 bolt main motor with billet crank i posted a week or 2 ago. Hopefully when all my existing peripherals get swapped over toit this problem doesnt come with it. But stuff like grounds, and intake gaskets, lifters, injectors will all get checked during the swap. Im gonna be beside myself if this carries over to that. But if it does i might swap out the ecm. I wonder about voltages at the ecm during warmup. but this is like grasping at straws.

The most frustrating thing is when you read through the psts of others with idle problems.

NONE OF THE OWNERS ACTUALLY POST WHAT THEY DID AS THE FINAL OUTCOME!!!!

Why ask for help if you dont give back the fianl anser to what the cause was. All you see is what they tried and what others told them to check.

Go search for yourself and you will see. Not a single post telling what the final outcome cause of the idle problem was!!!

 

[Rick Krupa]

I already checked TDC with the tool and was right on. Have you tried searching the old Sy/Ty archives at http://www.syty.org/archives/syty/search.html
I'm still trying to figure out my next step.
Also I have 63,000 miles on my original unopened engine. Just curious Ed how many miles you got on the Sy?

 

[ed hess]

just turned 98k. I had only been searching on the syty.net bbs right here.
Great now i got a whole new place to start searching.

Sure hope posters told others what the final outcome was on this syty.org site.

Ya thinkif i get some young blonde bimbo to drive it the problem might go away?

ed

 

[Rick Krupa]

The orginal Sy/Ty archives go back around 5-6 years and has alot of info on there. I have been with that list since almost the beginning but there is so much info it is a matter of sorting it all out and making your next plan.
Happy Reading !!!!

 

[SY756]

The most frustrating thing is when you read through the psts of others with idle problems.

NONE OF THE OWNERS ACTUALLY POST WHAT THEY DID AS THE FINAL OUTCOME!!!!

Why ask for help if you dont give back the fianl anser to what the cause was. All you see is what they tried and what others told them to check.

Go search for yourself and you will see. Not a single post telling what the final outcome cause of the idle problem was!!!

Ed, Not trying to start a war here. A idle problem, as everyone knows its a gremlin of its own. Everyone means well in responding when they post(most of the time), it's just kinda hard recommend what to do with a problem if your not there to hear or see the truck in person. And before you say NEWBIE, because of my posts, I have been around and owned my Sy since the days of the old "SYTY chat room", 5+ years.

Speaking of the chat room, is there still one? and if not, could we get one together? I know that now we have PMs, AIMs and ICQs but it was really nice to be able to talk or "listen" to a group of people real time.

 

[ed hess]

JUst seem to find a lot of topics with no post containg the final outcome. You wonder if they ever found the actual cause and repaired it.
ed