1993 instant misfire-much white gassy smoke-1993 89661-60220 ECM questions.

[surfpig]

You mentioned your wife in the first post, and I think that may be the problem. Send her down and I’ll have a look. I’ll pay airfare.

 

[baldilocks]

I had a rig misfire similarly to that after the #6 spark plug tube got some water down in it. It took lots of brain damage and troubleshooting. I was also surprised how such a small amount of water was causing the misfire. No CEL or anything else odd, just a misfire. Did you happen to get it wet back there during your work?

No. Have you read my last few posts? My CEL is not present when it should be with key ON. There is a short to ground somewhere in the harness and a fuel injector hung open. All this after I put my mitts on the engine harness near the egr tube. I have the parts so they will going in forthwith.

 

[baldilocks]

Step one: remove new harness and injectors from the spare engine.

 

[fjbj40]

I had a rig misfire similarly to that after the #6 spark plug tube got some water down in it. It took lots of brain damage and troubleshooting. I was also surprised how such a small amount of water was causing the misfire. No CEL or anything else odd, just a misfire. Did you happen to get it wet back there during your work?

I just put all new plugs and wires on mine, OEM. I also put an ample amount of Dow Corning #4 dielectric grease. One reason is it stops the plug wires from welding to the plugs and the second reason is it seals the plug to wire joint and I also put it on the upper grommet to help it seal on the valve cover. All I can do is hope that works, but it always has in the past for me

 

[baldilocks]

Number six injector wiring was the culprit and seems to be the problem cylinder in many cases. To begin with the connector retention lock was broken and someone did the ole RTV glue it on trick.

In the photo you can see that there is continuity between the #6 injector connector female receptacles. One is actually a ground and the other is now grounded to short through that one. I was hoping to find this exact problem because up until now I wasn’t sure I was barking up the right tree.

So much for wrapping an old engine harness..... this engine ran flawlessly until I decided to wrap and zip tie the harness by the egr pipe while the plenum was removed for other work.

 

[baldilocks]

#6 plug on the right looking nice and clean compared #5.

 

[baldilocks]

It’s very clear in this diagram why AM2 fusible link was blowing with #6 injector wiring shorted.

 

[fjbj40]

Did the wire break where it makes the hard bend out of the harness? If I remember there are a few of the inj wires that make a hard bend out of the harness.

 

[baldilocks]

No. The damage is most likely up a little higher in the area where the entire harness routes near the egr plumbing. I’ll take a look deeper into it tomorrow.

 

[baldilocks]

I had time to get deeper into removing the engine harness and revealed what you see in the photo. Let my lack of attention to deal with regards to valve cover installation be a lesson. I was hesitant to post this out of embarrassment but this forum has taught me a lot about my Landcruiser so I figure I should share with the community yet another way this tightly packed engine compartment can bite us if we don’t pay very close attention to detail.

Now that I’m in this far, I will go ahead and press on with the harness replacement.

 

[baldilocks]

After spending a good deal of time cleaning the intake manifold and finalizing other details it’s time to run the new harness into the cab. For those of us on an 80 series maintenance mission lockdown seems normal.

 

[baldilocks]

 

[OGBeno]

Wait.... a 1FZ is not tightly packed whatsoever....

This is tightly packed...

 

[baldilocks]

Wait.... a 1FZ is not tightly packed whatsoever....

This is tightly packed...

View attachment 2264548

Yep,the 1FZ is my relax time. Thanks for reminding me.

 

[fjbj40]

Wait.... a 1FZ is not tightly packed whatsoever....

This is tightly packed...

View attachment 2264548

But it is easier to work on! I thoroughly enjoy working on aircraft, as I do my Land Cruiser. But leaning over a LC fender for 8-12 hrs a day is way more painful vs working on any aircraft engine, from my 30 years in the industry anyways !

 

[fjbj40]

View attachment 2264504View attachment 2264505

After doing the same job this winter I feel this process is a mandatory job, for the age and mileage, to replace vacuum tubing, vsv, harness inspection/repair and intake cleaning along with TB and IAC. It is not a difficult job, only a bunch of gaskets.

Plus a very satisfying job!

 

[baldilocks]

But it is easier to work on! I thoroughly enjoy working on aircraft, as I do my Land Cruiser. But leaning over a LC fender for 8-12 hrs a day is way more painful vs working on any aircraft engine, from my 30 years in the industry anyways !

So you are old like me ..... I’m into it 30 years myself and looking forward to that Charles Taylor award.

 

[fjbj40]

I have read about that award in AMT, I don’t know if it goes to Canadians .
I don’t consider myself old, most days anyways, I am only 53 . My first job in aviation, baggage chucker, was in 1985, started as a mechanic in 1989.

 

[baldilocks]

I have read about that award in AMT, I don’t know if it goes to Canadians .
I don’t consider myself old, most days anyways, I am only 53 . My first job in aviation, baggage chucker, was in 1985, started as a mechanic in 1989.

I’m also 53 years young. 100 pushups a day helps. The Charles Taylor award goes to aviation mechanics that make 50 years of service. While most coworkers want to retire ASAP I’m looking at being the #1 mechanic at United. Here at PDX we have a mechanic with 1966 seniority and he is not #1 in the system yet but close.

 

[baldilocks]

A young coworker came over today and we ran the new harness into the glove box and connected it to the ECM. The spark plugs that were in when I bought this 80 are NGK G-Power platinums. It ran so damn well that I went and bought another set to install today. .032” gap.