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#2405236 - 11/17/17 08:52 PM 1989 cold start issues
wannadrag Offline
super stock

Registered: 11/27/09
Posts: 1199
Loc: WI
89 W250 360 engine,cool weather here,runs very rough on start up till warm almost seems to be running lean as it sputters like not enough fuel,new ignition temp sensor,map sensor and throttle position sensors.Took it to a mechanic and he seems to think ECM, It has a remanufactured mopar one on it with 4557391 part number that when i look it up comes back as a ECM for a 318. When i look up one for a 360 it shows like 3 different ones depending on the factory number which i dont have. Truck has a auto trans and was sold here in the midwest so that would rule out CA emissions type. Any ideas out there?

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#2405726 - 11/18/17 09:06 PM Re: 1989 cold start issues [Re: wannadrag]
jerseybud Offline
mopar

Registered: 04/25/04
Posts: 647
Loc: Maine
check the fuel pressure
then check the codes

Can almost guarantee its not ECM if it starts. If it took 20 minutes to start and relays were clacking, then maybe ECM. Even a 318 ECM on a 360 should satrt and idle very nicely, just not pull hard.

318 ecm in a 360 is a problem that should be fixed- BUT 89 360 ECMs were a one year only computer (14 pin and 60 pin connectors)

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#2406370 - 11/20/17 12:46 PM Re: 1989 cold start issues [Re: wannadrag]
SALEM1912 Offline
mopar

Registered: 03/09/07
Posts: 546
Loc: Southeast Pa.
Agree shouldn't be the ecm. Your truck should have air cleaner with the valve to draw warm air from the exhaust manifold when warming up. Make sure it is operating correctly. Also the vacuum hose should have a delay valve in it so it doesn't open on hard accelerate(vacuum drops off) You see in this picture the big tube is missing. Also your egr should not be opening till engine is at operating temp.


Attachments
dodge air cleaner (640x360).jpg




Edited by SALEM1912 (11/20/17 12:57 PM)

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#2406373 - 11/20/17 12:50 PM Re: 1989 cold start issues [Re: wannadrag]
Paul_Fancsali Offline
master

Registered: 01/21/03
Posts: 2928
Check the bottom of the coil for rust or leakage I replaced a lot of them way back when

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#2406446 - 11/20/17 02:51 PM Re: 1989 cold start issues [Re: Paul_Fancsali]
buildanother Online   content
I Live Here

Registered: 08/30/05
Posts: 11247
Loc: chicagoland,usa
Also make sure that idle speed motor (seen in above photo) is working. They do a bit of moving at lower speeds, idle and shutdown time.

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#2406784 - 11/21/17 10:21 AM Re: 1989 cold start issues [Re: wannadrag]
wannadrag Offline
super stock

Registered: 11/27/09
Posts: 1199
Loc: WI
I ordered the correct ECM, should be here in a few days. At least if it still runs crappy I can rule that out and start checking elsewhere for issues.

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#2408692 - 11/25/17 12:36 PM Re: 1989 cold start issues [Re: wannadrag]
CHRGR69 Offline
pro stock

Registered: 06/07/05
Posts: 1422
Loc: Florida
Runs rough until warm. Sounds like a Mopar to me!
_________________________
Grandma always said I had "hands of gold"!

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#2408932 - 11/25/17 09:50 PM Re: 1989 cold start issues [Re: CHRGR69]
SALEM1912 Offline
mopar

Registered: 03/09/07
Posts: 546
Loc: Southeast Pa.
LOL I second that! Started working on Mopars around 1976 just when emissions were new. Seems all we did was cold start concerns. Thank God for FI around '84-'85.

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#2414525 - 12/06/17 10:14 PM Re: 1989 cold start issues [Re: wannadrag]
wannadrag Offline
super stock

Registered: 11/27/09
Posts: 1199
Loc: WI
Changed out the ECM and still runs like crap when cold. Speeds up and slows down pretty much steady till its warm. Removed the idle speed motor and it still does it. The truck is unmolested so the warm air stuff is all hooked up. Maybe some crap in the throttle body?

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#2415028 - 12/07/17 09:45 PM Re: 1989 cold start issues [Re: wannadrag]
poorboy Offline
master

Registered: 01/19/03
Posts: 6410
Loc: Freeport IL USA
Its got new plugs, plug wires, cap & rotor, and a new air filter, right? lots of people want to jump in on the hard stuff when the problem is often the basic stuff ignored. Gene

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#2415476 - 12/08/17 07:58 PM Re: 1989 cold start issues [Re: poorboy]
wannadrag Offline
super stock

Registered: 11/27/09
Posts: 1199
Loc: WI
Originally Posted By poorboy
Its got new plugs, plug wires, cap & rotor, and a new air filter, right? lots of people want to jump in on the hard stuff when the problem is often the basic stuff ignored. Gene
Yup all new, I have a 91 also with a 360 and am thinking of taking the throttle body and trying it on the 89.I just don't get why it idles up and down till its warm. As soon as the temps got in the 40s it stated acting up. I bought the truck this summer so I am sure the issue was there already.

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#2416325 - 12/10/17 02:37 PM Re: 1989 cold start issues [Re: poorboy]
SALEM1912 Offline
mopar

Registered: 03/09/07
Posts: 546
Loc: Southeast Pa.
You might check the TPS reading while this is happening .They tend to wear at the idle position. It you see it jumping around while your foot is off the pedal it's bad. Also a lite tap it might show up.

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#2419329 - 12/15/17 10:30 PM Re: 1989 cold start issues [Re: wannadrag]
383man Offline
Too Many Posts

Registered: 01/19/03
Posts: 26889
Loc: Balt. Md
Just curious as when it runs bad cold whats the temp like where you are at when cold ? I ask because I had problems in winter time cold weather in Md where I live whenever it was cold and damp. But mine was a carb on my 318 Ramcharger. My problem was my hot air intake on the air cleaner was not working and after the truck started within a few minutes it started running bad and chugging as I found out the door on the air cleaner was not closing to give me hot air from around the exh manifold and it was still getting the cold damp outside air. What happened was the carb throttle blades were icing up even though it would happen at 30 to 45 degrees. I cant remember but you 89 should be throttle body injection and may still use the heated air intake from the air cleaner. When hot the door stays open and the air in the eng come from the air cleaner snorkel but when colder that door should get vacum to it from a temp sensor in the air cleaner that lets the eng now pull hot air from around the exh manifold shield. And believe me it makes a big difference in the right temp days that can be damp and chilly and the throttle blades can ice up real easy with cold damp air going by them. After I fixed my hot air door I could start my truck and go in the house while it warmed up. Five minutes later it was still running great but when it was not working it would die in about 2 minutes and run bad until the eng and under hood was warm. Dont know if thats your problem but its worth making sure the air cleaner door is working right. Ron


Edited by 383man (12/15/17 10:33 PM)
_________________________
My car...63 Sport Fury Max Wedge wanna be street car..with new 493 pump gas full exh eng.......10.76 @ 124.49 ! ! ! My page on the cool 62-65 Mopar site ! http://www.1962to1965mopar.ornocar.com/mmo82008.html

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#2419330 - 12/15/17 10:40 PM Re: 1989 cold start issues [Re: wannadrag]
383man Offline
Too Many Posts

Registered: 01/19/03
Posts: 26889
Loc: Balt. Md
After reading this more it sure sounds like your air cleaner door is not working to give the eng the hotter air from around the exh manifold. Because like you mine would start acting up whenever it got about 40 or below and your eng is throttle body injected so it still has the cold fuel going on the throttle blades like a crab does but a crab wont have fuel hitting the throttle blades at idle. Your Throttle body inj will have a little fuel going by the throttle blades at idle but not alot of fuel. Believe me I was surprised to find out that the throttle blades were actually icing a bit and it fixed mine right up when I fixed the air cleaner hot air door to work. Good luck , Ron


Edited by 383man (12/15/17 10:43 PM)
_________________________
My car...63 Sport Fury Max Wedge wanna be street car..with new 493 pump gas full exh eng.......10.76 @ 124.49 ! ! ! My page on the cool 62-65 Mopar site ! http://www.1962to1965mopar.ornocar.com/mmo82008.html

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#2424334 - 12/27/17 09:37 AM Re: 1989 cold start issues [Re: wannadrag]
wannadrag Offline
super stock

Registered: 11/27/09
Posts: 1199
Loc: WI
Turns out it was the fuel injectors. It was about the only thing left to try. Runs like a champ now.

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