I have a 1986 D150 225 /6. I have replaced the carb. fuel lines, fuel filter and fuel pump. Now it runs until warmed up or under a load like going up a hill, then it stalls and dies and if I wait about 10-15 min. it'll start. It does not have a very strong spark, it's orange or red, not blue but the coil is not getting hot. I suspect the ignition module but don't know where it is. I think it's mounted right on the firewall, but the connector has three pins and looks way different than the part at Advance auto or OReilly's.

If you have a slant in an 85 truck, it is probably not the original, they quit making slants in 84 (I think,). ON my D-150 it is mounted on the side of the air cleaner.

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82 D150-225/727
02 Dakota-3.9/5 speed
87 GMC C7000-8.2 Detroit Diesel/5+2

Last year for Slant-6s in trucks and vans in the US and Canada was 1987. Last year for volume-production Slant-6s in trucks and vans elsewhere (e.g. Mexico) was 1991 or so. Last year for Slant-6s in passenger cars was 1983.

Topherice: Where do you live and what kind of emission laws do you have to comply with? The thing you're looking at on the firewall isn't the ignition module, it's an EGR temperature sensor. The primitive spark control computer on the late Slant-6s is known for causing poor driveability and running faults. If your local emission laws allow it, you'll want to retrofit a standard electronic distributor instead.

I live in Jacksboro, TN. When I bought the truck the Smog Pump had already been removed. I'm also thinking about taking off the Catalytic and running a straight pipe. So, you think it's maybe a spark problem as well, and I need to look at replacing the ditstributor?

A Federal crime, but if it's not enforced in your area, you might as well -- with the air pump gone, the cat is useless and probably melted internally.
Install a standard electronic distributor and control box. You can get these all day long on Ebay.

I little more information about your truck would be helpful. Automatic or manual transmission? Federal or California emissions? Most likely your truck has a ESA (Electronic Spark Advance) computer, not a electronic control module. 1986 and 1987 trucks have the computer mounted (hanging) inside the fender alongside the battery. You should find it there. Look for a fat wire harness and a vacuum hose going to it.

From your description of a weak red/orange spark and engine stalling after it gets hot...... I would suspect the ignition coil. It could be breaking down inside and those are typical symptoms of that. I would try a different coil first. Also might be a good idea to check all the connections in the wiring for a loose or corroded connection (if a different coil does not fix the problem) but that may be a big job to find all of them.

Contrary to popular (opinion / belief / misconception / misinformation) in this forum........ The ESA computer on the 1986-87 trucks is a really nice unit. Keep it working. Also if you have an automatic transmission, the ESA computer controls the lock-up torque converter in the transmission. 1986-87 Slant 6 trucks are the only slant 6 engine to come from the factory with a electronically controlled lock-up torque converter. If you ditch the ESA computer, you loose the lock-up torque converter feature.

No No No Mr. Know-it-all........ on 1986-87 Slant 6 trucks, any and all EGR temperature sensors are screwed into the cylinder head/engine. Also there are no EGR electronic control boxes on the firewall for this vehicle either. Any electronic EGR timer/control function is now incorporated in the ESA computer (which controls the solenoid over by the right side hood hinge for EGR timer delay function).
Where did you get this information from? Please disclose the source and transcript of any such information.

Here, Craig, have a lollypop. It'll brighten your day. And I'll get you a fresh bowl of Cheerios; somebody's obviously pissed in yours.

While you're workin' on your Cheerios and lollypop, I'll be reserving the rights to be wrong once a month (but no oftener!), and to have opinions and experience that differ from your own.

Ruh-roh! I think I hear Al Gore headin' to Tennessee...

D/W

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If it ain't broke, fix it!

You just wait...he's going to make you drive over there and suck on that tail pipe first before he signs the ticket. The fine will be based on how long it takes for you to perish--the slower it takes, the less it costs

Whachoo Say

D/W

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If it ain't broke, fix it!

Naw, when that Federal law was passed, Al Gore was still trying to figure out how to "invent" the internet...

Craig: thankyou! It seems correct information is getting harder to get. Its hard enough to answer some of the questions posted without having to dispel the incorrect information dispensed by the "D"s.

Like Red Green says:
",,,,the 3 hardest words for a man to say...I Don t Know"

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Yeah....Im the one who destroyed this rare, vintage automobile.....

Well, Sandy, y'know, that's the burden that comes with picking a board handle that starts with the letter "D". Dusteridiot, Doctor Dodge, Dart270, I guess I count 'cause of SlantSixDan...All of us "D"s have to meet our weekly quota for posts containing incorrect information, or we risk getting spanked.

I can't speak for any of the others, but as one of the "D"s, I'm sure glad you're one of the "S"s. Keep up the good work!

Hmmmm, wonder if I'm one of those "D"s allegedly dispensing all of this incorrect information??? Remember, when you point the finger at person(s), you are pointing three back at yourself. I haven't noted a single poster at this site who is infallable or has not posted something I do not totally agree or concur with. All of the "D"s I can think of seem to be fairly damn knowledgeable (if not as all-knowing as they may think ).

D/W

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If it ain't broke, fix it!