HO2 heaters

Tiny
QFONG
  • MEMBER
  • 92 POSTS
You know, it does handle very well.
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Saturday, March 6th, 2021 AT 7:23 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,777 POSTS
Hi,

I noticed it's been a couple days since we heard from you. Has any progress been made? We are interested in knowing.

Let us know.

Take care and God Bless,

Joe
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Monday, March 8th, 2021 AT 7:37 PM
Tiny
QFONG
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I've been driving it and the shifting has been erratic. A couple of times it started in first and didn't shift until 6,000 RPMs and I didn't have my foot in it. Then it would mostly start in 2nd and shift to 3rd. It wouldn't always go into reverse without moving the shift lever back and forth.
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Tuesday, March 9th, 2021 AT 2:37 PM
Tiny
STEVE W.
  • MECHANIC
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Drive it hard a couple times and see what it does, if it doesn't improve it will likely need to be rebuilt to replace the seals and clean out anything built up or sticking. Transmission fluid can become a sticky mess if allowed to set.
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Tuesday, March 9th, 2021 AT 3:03 PM
Tiny
QFONG
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Do you have a diagram of the wiring that goes to the diagnostic OBD1 trouble code reader connector?
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Wednesday, March 10th, 2021 AT 3:32 PM
Tiny
QFONG
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I found the diagram that I need.
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Wednesday, March 10th, 2021 AT 3:54 PM
Tiny
STEVE W.
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Was going to say there are some of them on this site. At least Ford didn't pull the GM type stuff and make them a mixed system.
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Wednesday, March 10th, 2021 AT 4:12 PM
Tiny
QFONG
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I found my old OBD1 code reader and it spit out about 6 faults but nothing to do with the transmission. So right now I'm working to correct these problems.
I am a snowbird currently in Florida with the wife and we will be going back to New Hampshire the middle of April. I don't know how far I will get with this car but there is always next winter.
In NH I have two older cars, an 1987 Mercedes 190e with a diesel engine from a 300sd and an 1988 Honda Civic with a 5.0 Ford V8 mounted midships driving the rear wheels. Runs like a rabbit.
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Saturday, March 13th, 2021 AT 3:15 PM
Tiny
JACOBANDNICKOLAS
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The Civic sounds a bit dangerous. LOL

What codes did you pull?

Joe
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Saturday, March 13th, 2021 AT 7:39 PM
Tiny
QFONG
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This car was built in October 1994 so I was told about 15 years ago that it used the Tempo/Topaz code system.

637 TOT sensor voltage above max voltage
327 EVP low
519 power steering unplugged
563 high speed fan
593 OH2 heater circuit bad (fixed)
341 octane circuit open (next)
551 intake runner circuit open
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Sunday, March 14th, 2021 AT 9:47 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,777 POSTS
You have quite a list. The definitions for the codes are accurate. The idea that that transmission is giving you trouble is likely related to the temperature sensor. Have you done any checking?

Since I jumped into this part way through, can you tell me the ultimate goal? There seem to be a few different concerns.
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Monday, March 15th, 2021 AT 11:26 AM
Tiny
QFONG
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The ultimate goal is to get this car running smoothly. I have found some wiring mistakes and been correcting them. Now I'm trying to find the octane adjust circuit.
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Monday, March 15th, 2021 AT 5:00 PM
Tiny
JACOBANDNICKOLAS
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Hi,

Take a look at the attached pic. Let me know if it helps.

Joe
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Monday, March 15th, 2021 AT 5:54 PM
Tiny
QFONG
  • MEMBER
  • 92 POSTS
Yes, that helps. Thank you.
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Tuesday, March 16th, 2021 AT 9:26 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,777 POSTS
Hi,

No problem. Let us know how you make out and what you find.

Take care,
Joe
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Tuesday, March 16th, 2021 AT 6:35 PM
Tiny
QFONG
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I found some components were miss-wired or had one wire not connected. I had to take out the PCM connector to make these wiring changes. Now I can't get it back connected to the computer. The 6 mm bolt will not thread into place.
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Wednesday, March 17th, 2021 AT 5:23 PM
Tiny
JACOBANDNICKOLAS
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How were they repaired? Is something preventing the connector from being seated? Check to make sure none of the pins were damaged or bent.

Joe
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Wednesday, March 17th, 2021 AT 6:34 PM
Tiny
QFONG
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It's my stupidity. The PCM had moved back because the clamp is missing so I made a new clamp and pushed the PCM into position. The connector went right on. Got too tired to try the engine. Tomorrow.
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Thursday, March 18th, 2021 AT 1:30 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

It can happen. LOL Let me know how it runs. Hopefully, it will be better.

Joe
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Thursday, March 18th, 2021 AT 5:55 PM
Tiny
QFONG
  • MEMBER
  • 92 POSTS
I "fixed" it real well. Now the fuel pump won't run unless I ground the wire from the PCM pin #22 that comes from the fuel pump relay. But then of course it won't shut off. Exactly what tells the fuel pump to turn on and off? I don't see any pressure switch. Is it current draw from the pump. Help.
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Saturday, March 20th, 2021 AT 1:57 PM

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