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Forum: Tech Help

11-23-2009, 01:32 AM

Replies: 34

'89 W124 300E cranks but no start

Views: 16,113

Posted By JohnnyBoy

I unplugged the connection at the upper left...

I unplugged the connection at the upper left coaxial-looking port of the EZL.
It is the crankshaft position sensor connection.

More details in this other thread:...

Forum: Tech Help

11-23-2009, 01:09 AM

Replies: 34

'89 W124 300E cranks but no start

Views: 16,113

Posted By JohnnyBoy

The CPS is always in the loop. To prove it (to...

The CPS is always in the loop. To prove it (to myself) I just went out and started it, then pulled the CPS plug from the EZL and it instantly shut off, just like turning off the key.

Forum: Tech Help

11-23-2009, 12:30 AM

Replies: 34

'89 W124 300E cranks but no start

Views: 16,113

Posted By JohnnyBoy

cliffmac, What is your reasoning for...

cliffmac,

What is your reasoning for thinking it is not the Crankshaft Position Sensor?

Another thing is, when it starts stumbling, if I press the accelerator and increase the RPM, it runs...

Forum: Tech Help

11-22-2009, 11:54 PM

Replies: 34

'89 W124 300E cranks but no start

Views: 16,113

Posted By JohnnyBoy

My understanding is: During crankshaft...

My understanding is:
During crankshaft rotation, the CPS sends a signal to the EZL (ignition control module), which in turn (thru some additional electronics) makes the ignition system work.
So,...

Forum: Tech Help

11-22-2009, 07:57 PM

Replies: 34

'89 W124 300E cranks but no start

Views: 16,113

Posted By JohnnyBoy

Many thanks to all who have replied to my...

Many thanks to all who have replied to my queries.
I value your collective experience, training, and advice.

I want to be as certain as possible about the Crank Position Sensor; $150 isn't...

Forum: Tech Help

11-18-2009, 07:38 PM

Replies: 34

'89 W124 300E cranks but no start

Views: 16,113

Posted By JohnnyBoy

I ruled out the FP relay based on: 1)While...

I ruled out the FP relay based on:

1)While driving, it stalled and wouldn't re-start
2)Immediately removed FP relay and installed bypass jumper (and fuel pump ran)
3)Still no re-start.

Am I...

Forum: Tech Help

11-18-2009, 05:46 PM

Replies: 34

'89 W124 300E cranks but no start

Views: 16,113

Posted By JohnnyBoy

I tested crank position sensor (cold) and it...

I tested crank position sensor (cold) and it measures 800 ohms.

While testing, I noticed the small vacuum tube at the EZL had become disconnected. That vacuum connection does the advance/retard of...

Forum: Tech Help

11-17-2009, 04:13 PM

Replies: 34

'89 W124 300E cranks but no start

Views: 16,113

Posted By JohnnyBoy

It happened again last night. This time it...

It happened again last night. This time it stalled out as I was pulling out of a parking lot into the street. Luckily, some bystanders helped me push it to a safe place. I inserted the fuel pump...

Forum: Tech Help

11-10-2009, 03:12 PM

Replies: 34

'89 W124 300E cranks but no start

Views: 16,113

Posted By JohnnyBoy

Bench testing it won't reveal an intermittent...

Bench testing it won't reveal an intermittent problem, can it? On mine, the casing looks molded on; appears impossible to open without destroying it. Am I missing something in how it is constructed?...

Forum: Tech Help

11-09-2009, 03:23 PM

Replies: 34

'89 W124 300E cranks but no start

Views: 16,113

Posted By JohnnyBoy

The fuel pump is pulling 8.6amps to 9amps. I...

The fuel pump is pulling 8.6amps to 9amps.

I have my emergency jumper ready made. What is the recommended diagnostic sequence to follow for next time the no-start occurs, in order to definitively...

Forum: Tech Help

11-05-2009, 03:44 PM

Replies: 34

'89 W124 300E cranks but no start

Views: 16,113

Posted By JohnnyBoy

At the time of the no-start condition, I did not...

At the time of the no-start condition, I did not check the fuel pump. How would I go about checking it, for when it happens next time?

Forum: Tech Help

11-04-2009, 02:41 PM

Replies: 34

'89 W124 300E cranks but no start

Views: 16,113

Posted By JohnnyBoy

Well it immediately started this morning no...

Well it immediately started this morning no problem, so didn't need to use my backpacked toolkit.

I removed the OVP. The socket and pins are clean and dry and free of corrosion. No rattling of...

Forum: Tech Help

11-03-2009, 11:25 PM

Replies: 34

'89 W124 300E cranks but no start

Views: 16,113

Posted By JohnnyBoy

OK thanks mak. I'll have to research the...

OK thanks mak.
I'll have to research the location of the relay, and location of those pins to be jumpered. So...I could connect the jumper, start the engine, and drive home. Right? It's OK safe...

Forum: Tech Help

11-03-2009, 09:48 PM

Replies: 34

'89 W124 300E cranks but no start

Views: 16,113

Posted By JohnnyBoy

'89 W124 300E cranks but no start

So I drive to the store (15min trip) and come out 10mins later and now it cranks but will not start. This has happened before but very intermittently (maybe one time per 2month), and always started...

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