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Author Topic: M42 Won't Start  (Read 10934 times)

kowalski

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« Reply #15 on: October 12, 2007, 07:09:57 PM »
coils connected to the right cylinders...?
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KenC

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« Reply #16 on: October 12, 2007, 08:45:52 PM »
Quote from: kowalski;35628
coils connected to the right cylinders...?


I should edit the title of the thread.

After further investigation, I AM getting spark.  Just won't start.
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kowalski

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« Reply #17 on: October 13, 2007, 12:41:57 AM »
yeah, you will get spark if they're connected wrong, you will just get spark at the wrong time which will make it not start.
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RED IS 91

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« Reply #18 on: October 13, 2007, 05:53:06 AM »
Are you sure your fuel pump is working ? Can you hear it when you turn the Key to the on position ? There is supposed to be around 42 pounds of pressure in the fuel system .
Sounds to me like the fuel pump went or is going and not making enough pressure. Connect a fuel pressure guage at the tank under the seat to make sure you are getting fuel pressure .
good luck

also check your fuel pump relay
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KenC

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« Reply #19 on: October 14, 2007, 02:32:20 PM »
The fuel pump is fairly new (from the dealer) and it is working.  Fuel is reaching the cylinders.

Wires are connected to the right cylinders.
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KenC

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« Reply #20 on: October 14, 2007, 10:48:24 PM »
UPDATE:

Tried the WOT start - Nothing

Pulled the valve cover off. Rotated the crank to TDC. Cams looked to be pretty perfect. Hasn't jumped a tooth.

We're still baffled at this point.
We decide to compression test it just for shits. I had done this about a month ago and got 190-210 on all four so I wasn't expecting anything too drastically different. Boy was I wrong.

ALL cylinders are reading 80-100psi for compression.

We put the valve cover back on and did a leak down on three of the cylinders - 90% leakage on all of them. We can't find where it's leaking from, but it sounds like the air is coming right back up from the sparkplug holes.

We then do another compression test. ZERO compression now. I'm not sure how in the course of 15-20 minutes I could go from 80-100psi (which is WAY low for the M42) down to absolutely nothing.

We even had a running M42 to compare with so we could rule out the gauges being faulty.

We're pulling the head tomorrow.


WTF could cause that? All of the cylinders have essentially no compression now.
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kowalski

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« Reply #21 on: October 15, 2007, 12:48:28 AM »
dip your compression tester screw in oil, or rub it around it and redo it and make sure it has the 0ring on it
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KenC

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« Reply #22 on: October 15, 2007, 12:50:22 AM »
Quote from: kowalski;35742
dip your compression tester screw in oil, or rub it around it and redo it and make sure it has the 0ring on it


We did.  And we tested it on another M42 to make sure it wasn't fouled.
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KenC

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« Reply #23 on: October 17, 2007, 12:32:37 PM »
We took the head off of the car last night and everything looked fine.  It's going to be pressure tested today or tomorrow.  If everything turns out well we're going to get another gasket and slap it back on.
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vitesse

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« Reply #24 on: October 17, 2007, 01:08:46 PM »
talk about strange, I've been thinking of ideas for you but am coming up empty, let me know what happens when its all back together, that compression issue is strange...
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95Compact

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« Reply #25 on: November 14, 2007, 08:03:31 PM »
Hey, have you figured out what the problem was?
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velomech

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« Reply #26 on: January 29, 2008, 06:40:11 PM »
Hey there, this is my first post, so not to sound like an idiot, but I have seen several scenerios like the one you described...

First, the fuel pressure regulator goes iffy, allowing too much pressure, flooding the engine.

Each cylinder is soaked in gas, which washes the cylinder down and gives the impression of having no compression. One remedy is squirting a little bit of motor oil in each cylinder AFTER a good suirt of STARTER FLUID. Usually will crank right up.

I know it sounds bizarre, but I've seen it happen. One minute all is fine, then the next, it isnt running and after a compression test, it's bad news. All this because the cyclinders got totally soaked with fuel.

Just my .02, hope it helped allthough, the thread started two months ago....


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KenC

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« Reply #27 on: February 07, 2008, 08:35:23 PM »
Sounds plausible.  I'm going to give it a try tonight.
Was working after reassembly, but is dead again.
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KenC

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« Reply #28 on: February 08, 2008, 02:30:28 AM »
Success.

I just dumped like a cap and a half of oil into each cylinder and it fired up.  I'm going to order a new FPR tomorrow.
I don't think it's the rings because it's not a constant problem.  That and I compression checked the engine luke-warm a few months ago and it was 190-200 on all of them.
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whipsey

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« Reply #29 on: February 16, 2008, 01:26:49 PM »
where abouts is the fuel pump relay cause this sounds like the same problem i have
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