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Search: Posts Made By: billr
Forum: S-Series Tech 04-04-2020, 09:22 PM
Replies: 52
Views: 829
Posted By billr
Re: Changed valve body with updated still limp mode

The # sounds about right, my'94 manual is 21022422.

As for using the Fed version rather than CA, that may be a problem. For '94 the CA cars got the new electric EGR valve. If yours has that,...
Forum: S-Series Tech 04-04-2020, 12:47 PM
Replies: 52
Views: 829
Posted By billr
Re: Changed valve body with updated still limp mode

My '94 (SL2, manual) PCM certainly just died. The definitive symptom was that the 5V supply would not always come up to 5V promptly, or fully, at key-on. It was intermittent for many months, then...
Forum: S-Series Tech 04-04-2020, 12:38 AM
Replies: 52
Views: 829
Posted By billr
Re: Changed valve body with updated still limp mode

More likely I am wrong about the position of that light on the dash. That is the light I call "Hot". You describe it as below, sounds like the same thing to me:

"Iíve been reading trans codes...
Forum: S-Series Tech 04-04-2020, 12:27 AM
Replies: 19
Views: 1,548
Posted By billr
Re: can't rid myself of P0401

OK, I missed that. Agreed, if the passages in the head/manifold have not been cleaned out, then that should be the very next step.
Forum: S-Series Tech 04-03-2020, 10:35 PM
Replies: 52
Views: 829
Posted By billr
Re: Changed valve body with updated still limp mode

The "Hot" light is the one that blinks the trans codes; over on the RH side of the tach. Are you reading codes some other way, like with a scanner?
Forum: S-Series Tech 04-03-2020, 10:24 PM
Replies: 19
Views: 1,548
Posted By billr
Re: can't rid myself of P0401

I agree the EGR valve or passages are the most common causes, but the (recent) OP was asking how the problem could persist when those had been "fixed".

All the sensors you mentioned below, except...
Forum: S-Series Tech 04-03-2020, 09:13 PM
Replies: 19
Views: 1,548
Posted By billr
Re: can't rid myself of P0401

Cheyne, do you have access to the PCM source-code, do you know that all it does is look at the change in MAP, and know the exact values?

I'm thinking that the PCM also looks at the O2 sensor and...
Forum: S-Series Tech 04-03-2020, 08:55 PM
Replies: 52
Views: 829
Posted By billr
Re: Changed valve body with updated still limp mode

The (trans) 55 code has nothing to do with the 10-pin. That sensor/connector is in front of the trans, under the spin-on filter. Likewise, the 56 failure may be of an FET unrelated to the...
Forum: S-Series Tech 04-03-2020, 05:38 PM
Replies: 19
Views: 1,548
Posted By billr
Re: can't rid myself of P0401

That code, for "Insufficient EGR Flow" is too vague to be of much use. There is no meter/sensor in the system to actually measure flow, so the PCM has to infer "insufficient flow" from what is...
Forum: S-Series Tech 04-03-2020, 05:21 PM
Replies: 52
Views: 829
Posted By billr
Re: Changed valve body with updated still limp mode

The PCM does not have removable PROM, it has to be "flashed" to the desired config. I would expect that most Chevy dealers still have the tools and info needed to do that. Actually, any GM dealer,...
Forum: S-Series Tech 04-03-2020, 12:13 PM
Replies: 43
Views: 734
Posted By billr
Re: Diver's side leak.... looks like ATF

Yep, I meant IAT sensor; sorry for the mistake. I can't even claim it was a typo... I just was typing faster than I was thinking (and I don't type very fast!).
Forum: S-Series Tech 04-03-2020, 12:07 PM
Replies: 4
Views: 168
Posted By billr
Re: Sl1 blown head gasket

This is an SL1, correct? Is this your second head-sealing problem with this engine? I wonder if the head might have a crack near the cam journal, doesn't that cause this kind of mixing of oil and...
Forum: S-Series Tech 04-03-2020, 12:26 AM
Replies: 52
Views: 829
Posted By billr
Re: Changed valve body with updated still limp mode

There are commercial spray "contact cleaner" solvents, CRC Chemicals is a well-known vendor. However, I think you could do fine with alcohol or WD-40. Acetone is also a possibility, but just may...
Forum: S-Series Tech 04-02-2020, 10:52 PM
Replies: 52
Views: 829
Posted By billr
Re: Changed valve body with updated still limp mode

Yes on the ABS module being alongside the PCM; at least, that is the way it was on my '95.

My recollection is that the screw on the 10-pin connector goes in with very light torque but bottoms out...
Forum: S-Series Tech 04-02-2020, 07:57 PM
Replies: 52
Views: 829
Posted By billr
Re: Changed valve body with updated still limp mode

One of those PCM feeds is "always hot" to keep the memory settings alive; and the other is switched on by the ignition switch when you want to operate the engine. I think the PCM 1 is the switched...
Forum: S-Series Tech 03-31-2020, 09:37 PM
Replies: 43
Views: 734
Posted By billr
Re: Diver's side leak.... looks like ATF

The ECT and trans temp sensors seem to last OK. We rarely (never?) hear of problems with them. It doesn't make sense to me that the trans sensor lasts, as the trans fluid gets hotter than the engine...
Forum: S-Series Tech 03-30-2020, 11:15 PM
Replies: 10
Views: 249
Posted By billr
Re: Po340 that I cannot clear

DIS and EIS mean the same thing, the whole ignition system including the CKP/CMP sensors, coils, plugs, wires, coil drivers, and PCM. The ICM is one component in the system. It has the CKP/CMP...
Forum: S-Series Tech 03-30-2020, 09:06 PM
Replies: 52
Views: 829
Posted By billr
Re: Changed valve body with updated still limp mode

Trans 15: "Hot Lamp Illuminated" (a Flag, not a Code)

Engine 15: "ECT Circuit -- Temperature Out of Range Low"

FYI: I don't know if that means the temp is low, or the sensor...
Forum: S-Series Tech 03-30-2020, 05:49 PM
Replies: 11
Views: 481
Posted By billr
Re: Creaky Cracky sound sl

Interesting, I was not aware that the sway bar is hollow with inserts on the end. I can understand how that could make a "creaky" noise, and that it was very difficult to catch.
Forum: S-Series Tech 03-30-2020, 05:43 PM
Replies: 52
Views: 829
Posted By billr
Re: Changed valve body with updated still limp mode

Trans 15 is on my list, I suppose the one in that link isn't quite perfect.

The 12V for the five solenoids comes in on that 10-pin connector, but it is supplied to the connector through the fuel...
Forum: S-Series Tech 03-30-2020, 12:21 PM
Replies: 10
Views: 249
Posted By billr
Re: Po340 that I cannot clear

How about the wire from the ICM to PCM for that CMP signal? Don't overlook that.
Forum: S-Series Tech 03-30-2020, 12:15 AM
Replies: 52
Views: 829
Posted By billr
Re: Changed valve body with updated still limp mode

Please confirm that you are reading those codes (15, 55, & 56) on the "engine hot" dash light. Trans code 15 means the "engine hot" light is on.

I urge you to check the 12V at the 10-pin...
Forum: S-Series Tech 03-29-2020, 10:12 PM
Replies: 93
Views: 2,610
Posted By billr
Re: Cylinder Head Removal - DOHC

You may hear horror stories about Dexcool, but that old gasket looks like it might have made it another 23 years if the head didn't have to come off because of the valve. Good enough life for me...
Forum: S-Series Tech 03-29-2020, 10:07 PM
Replies: 52
Views: 829
Posted By billr
Re: Changed valve body with updated still limp mode

The PCM is under the dash, above the driver's left foot.

There are three "screw-in" sensors: "trans fluid temp" and "turbine speed" are under the spin-on filter (larger one is turbine speed), and...
Forum: S-Series Tech 03-29-2020, 06:33 PM
Replies: 43
Views: 734
Posted By billr
Re: Diver's side leak.... looks like ATF

It is on the rear of the trans (manual), kind of under the brake master cylinder.
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