90 Trooper 2.8L V6-Failed AZ State Emissions Test

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Re: Failed AZ State Emissions Test-1990 Trooper 2.8L V6

Postby troopdiver » Thu May 18, 2017 11:41 pm

Yes Ed, I agree. I think the distributor was at the root of my problems.
I just wish I had found the problem a little earlier.
Thanks again for all of your help.
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Re: Failed AZ State Emissions Test-1990 Trooper 2.8L V6

Postby troopdiver » Thu May 18, 2017 11:43 pm

AS A SIDE NOTE: Every time I attempted to put the truck into diagnostic mode and to get the check engine light to give me error codes, I never received any codes. The check engine light simply blinked 1 then 2, over and over again. There had to be something wrong somewhere because I could not pass the emissions test. I wonder if there was something disconnected somewhere? I will probably never figure out why it did not give me any error codes. I will try it again later down the road.
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Re: Failed AZ State Emissions Test-1990 Trooper 2.8L V6

Postby troopdiver » Fri May 26, 2017 2:02 am

In the hopes of maybe helping someone else down the road, here are a few more PICs showing the wires, connectors and components inside of the distributor.
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Last edited by troopdiver on Sat May 27, 2017 10:02 pm, edited 11 times in total.
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Re: Failed AZ State Emissions Test-1990 Trooper 2.8L V6

Postby troopdiver » Fri May 26, 2017 2:07 am

Here are five more PICs. Enjoy!
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Last edited by troopdiver on Sat May 27, 2017 9:44 pm, edited 2 times in total.
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Re: Failed AZ State Emissions Test-1990 Trooper 2.8L V6

Postby geoffinbc » Sat May 27, 2017 1:40 am

Your getting code 12. Thats perfectly normal it just means the ECM is in diagnostic mode. If no other codes follow your good.
1990 Trooper, 3.2L (3.1L .040 over) Pushrod V6, 5 speed manual. 33X10.50X15 BFG M/T KM2's. 3" OME Lift. Cowl Induction Intake. ARB Lockers front and rear. HD Tierods.
Off the road for an overhaul right now.

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Re: Failed AZ State Emissions Test-1990 Trooper 2.8L V6

Postby Ed Mc. » Sat May 27, 2017 1:55 am

It's possible to have malfunctions outside the parameters of the ECM, such that you may never get a code but there is still something wrong.

The engine diagnostic program only monitors certain things, so unless the problem is causing a system that it does check to be out-of-whack, it'll never show up as a trouble code.

But it's always a good thing to start with checking codes, 'cause if there are any, they may lead you to the problem, directly or indirectly.

Glad you got 'er all sorted out.......ed
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Re: Failed AZ State Emissions Test-1990 Trooper 2.8L V6

Postby batvette » Tue May 30, 2017 4:43 pm

LOL, outside of the obvious bad components that needed replacing, you did a lot of work that may not have to have been done.... you could have just replaced the cat and gotten the same result. Especially if HC is the problem.
A new cat can cover up a lot of minor issues but it seems to be the last thing people want to replace. I got a new one at pep boys for $53 with a 20% off coupon, (place order online pu in store) took it to a muffler shop they welded it in for $70. So cheap I let em talk me into a muffler too for another 90.
Consider the cat the last line of defense for smog on your engine. If it aint workin right then everything else has to be absolutely 100% perfect for any chance of passing. If its new it works so good everything else can be marginal.
Lucky you arent in CA. Visual inspection.... treadmill at different speeds... nitrous oxides.. lowered allowable emissions as the vehicle ages.
Not complaining. When I was 12 years old in 1974 went to Disneyland on a hot summer day. Air all over the basin was thick brown seemed like you could cut it with a knife. Made your eyes water.
Not anymore.
(Note Im not a smog tech just speaking from personal experience and the research I did going through it. That new cat allowed me to pass despite a fully non op EGR system, which I discovered an hour before the shop closed on the last day of my 30 day free retest period. Didnt have time to fix it took a chance....)
Couple other things. While its true you want the cats well heated up you want the engine not at its hottest and its better to take the test on a cool humid morning. Particularly if nitrous oxides are an issue because they get generated with high combustion chamber temps.
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