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Forum: S-Series Tech 01-16-2022, 04:39 PM
Replies: 15
Views: 198
Posted By billr
Re: Crank No Start Diagnosis

OK, I think I understand what you are seeing. The coil drivers must be in the ICM; it doesn't show that way in the (Chilton's) schematic I have.

What problem are you having attaching the image,...
Forum: S-Series Tech 01-16-2022, 02:01 PM
Replies: 26
Views: 389
Posted By billr
Re: Saturn SC2 1996 Intermittent starter problems

And I was negligent in rewriting my post yesterday. I will try to do better today. I write/type pretty slow and got kind of frustrated (not at you) when it was lost.
Forum: S-Series Tech 01-16-2022, 01:59 PM
Replies: 15
Views: 198
Posted By billr
Re: Crank No Start Diagnosis

Help me learn here: was the signal on C and E literally a square wave (or close to it), or short pulses? Was the amplitude 5V or 12V? I'm trying to figure out if those pins (edge) trigger drivers...
Forum: S-Series Tech 01-16-2022, 12:55 AM
Replies: 2
Views: 60
Posted By billr
Re: Center console extra warm next to shifter

The trans is far away from that console, no need to worry about it. the only thing I can think that would heat that console is the exhaust/cat plumbing that passes under there. Maybe a heat shield...
Forum: S-Series Tech 01-15-2022, 10:11 PM
Replies: 15
Views: 198
Posted By billr
Re: Crank No Start Diagnosis

Did you have the harness connected to the ICM, so the drivers were loaded? If so, it would seem you either have a bad ICM or two bad coils (I assume no spark from the 2-3 coil, either). That is...
Forum: S-Series Tech 01-15-2022, 07:54 PM
Replies: 15
Views: 198
Posted By billr
Re: Crank No Start Diagnosis

Clarify: when you say "nothing unusual" does that mean you do see a waveform of low duty-cycle pulses? If so, then the CKP sensor must be working OK. You could verify by checking injector pulses...
Forum: S-Series Tech 01-15-2022, 04:49 PM
Replies: 15
Views: 198
Posted By billr
Re: Crank No Start Diagnosis

They will be very short duration pulses, I'm not sure whether they will be positive-going or negative. At virtually all engine speeds the pulses will only be a few msec. At 6000 rpm, when frequency...
Forum: S-Series Tech 01-15-2022, 03:20 PM
Replies: 15
Views: 198
Posted By billr
Re: Crank No Start Diagnosis

Since you have a scope, check the drive signals to the ICM (pins C and E). Do this with the harness connected to the ICM (back-probing) so that there is a load on the drive circuit. You could...
Forum: S-Series Tech 01-15-2022, 02:01 PM
Replies: 26
Views: 389
Posted By billr
Re: Saturn SC2 1996 Intermittent starter problems

Well, crap! I had a nice long reply to get you started, but lost it because my login timed-out. I'll try again this afternoon/evening.
Forum: S-Series Tech 01-14-2022, 03:05 PM
Replies: 26
Views: 389
Posted By billr
Re: Saturn SC2 1996 Intermittent starter problems

Get sockets with only six points, the 12-point can work in many cases, but will round off a hex that is very tight.

To use the voltmeter you will either need to have a helper handy or have a set...
Forum: S-Series Tech 01-12-2022, 01:00 AM
Replies: 26
Views: 389
Posted By billr
Re: Saturn SC2 1996 Intermittent starter problems

Any clue what voltage your boss found at the car battery, when trying to crank with jumper cables to another battery? I understand why you feel the battery is OK, I'm not questioning that right now....
Forum: S-Series Tech 01-11-2022, 01:43 PM
Replies: 26
Views: 389
Posted By billr
Re: Saturn SC2 1996 Intermittent starter problems

Did the boss measure voltage, or was it current? Was it at the "donor" battery/cables, or at the car battery/wiring? This is sounding like a simple problem with the big power/ground cables, but we...
Forum: S-Series Tech 01-10-2022, 11:59 PM
Replies: 103
Views: 2,603
Posted By billr
Re: specifics on compression testing, P0301

Yes, I would expect the blocked EGR to cause a fail in two ways: it will probably increase the tail-pipe NOX above limits and it will probably set some more EGR-related codes. Let's see what codes...
Forum: S-Series Tech 01-10-2022, 10:13 PM
Replies: 26
Views: 389
Posted By billr
Re: Saturn SC2 1996 Intermittent starter problems

Again, no single wire is the obvious problem here; there has to some competent trouble-shooting done or you may continue throwing parts at it.

Do I understand correctly, this is a "no crank"...
Forum: S-Series Tech 01-09-2022, 02:58 PM
Replies: 103
Views: 2,603
Posted By billr
Re: specifics on compression testing, P0301

I saw no problem with the routing, but have you checked the plug wires for resistance and shorts? Neither is likely to cause that P0340, however.

Yes, reset the code and see if it comes back, and...
Forum: S-Series Tech 01-08-2022, 09:38 PM
Replies: 103
Views: 2,603
Posted By billr
Re: specifics on compression testing, P0301

That looks OK to me. You have marked in red where 1 and 4 are close, but that much is usual since the wires connect to the coil towers so close together. Also, "crossing" like that minimizes...
Forum: S-Series Tech 01-08-2022, 03:50 PM
Replies: 17
Views: 7,543
Posted By billr
Re: 98 sl2 - turn signals not working / hazards working normal

Was the replacement flasher known to be good? "New" does no longer mean "known good". Everything is returnable these days, no telling what happened to it before you.
Forum: S-Series Tech 01-08-2022, 03:43 PM
Replies: 103
Views: 2,603
Posted By billr
Re: specifics on compression testing, P0301

Use the end off of a steel can. I think you could get a gasket out of a 28oz can, but one of those big "gallon" ones for sure!

Are the #1 and 4 plug wires separated as much as possible as they go...
Forum: S-Series Tech 01-07-2022, 08:44 PM
Replies: 103
Views: 2,603
Posted By billr
Re: specifics on compression testing, P0301

The P0340 is usually because the spark-plug wires are not routed properly. Post a picture of how you have them so we can do a visual inspection.

Have you tried blocking of the EGR ports with a...
Forum: S-Series Tech 01-01-2022, 04:13 PM
Replies: 103
Views: 2,603
Posted By billr
Re: specifics on compression testing, P0301

Oh, I looked at the link. I'm not saying that GM hasn't used an EGR with stepper; I'm only insisting the '94-99 Saturn S-series EGR doesn't have a stepper.

But yeah, let's drop it. Anybody...
Forum: S-Series Tech 01-01-2022, 02:44 PM
Replies: 103
Views: 2,603
Posted By billr
Re: specifics on compression testing, P0301

They are called "linear", and certainly operate in an analog/proportional mode, but they are not steppers.

Want a sanity check? Count the electrical connector pins/wires, there are only five: ...
Forum: S-Series Tech 12-31-2021, 11:28 PM
Replies: 103
Views: 2,603
Posted By billr
Re: specifics on compression testing, P0301

These EGR valves do not use a stepper. The pintle is positioned by a "voice coil" solenoid. I don't know whether the electric drive is PWM or true analog DC current; but that doesn't really matter....
Forum: S-Series Tech 12-31-2021, 02:40 PM
Replies: 103
Views: 2,603
Posted By billr
Re: specifics on compression testing, P0301

How about the air filter itself, is it relatively clean-looking? Have you looked through all the plastic ducting to be sure there is no blockage? Regardless, a "blocked intake" is unlikely the...
Forum: S-Series Tech 12-30-2021, 03:47 PM
Replies: 103
Views: 2,603
Posted By billr
Re: specifics on compression testing, P0301

Between 3AM and 5AM you can do pretty much anything you want; especially on a Sunday morning.

However, I think you are overly concerned about this. I have driven a wide variety of "illegal"...
Forum: S-Series Tech 12-29-2021, 02:13 PM
Replies: 103
Views: 2,603
Posted By billr
Re: specifics on compression testing, P0301

OK, I understand that operation over 30 is simply unknown, not necessarily "bad". Do you hold it in lower gears manually sometimes and accelerate fast (or up steep hills), so the engine is seeing...
Showing results 1 to 25 of 500

 
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