No crank- OVP? - PeachParts Mercedes-Benz Forum

krjt · #1 10-16-2010, 12:43 AM

I was having some issues with no cranking in P position, but it always worked in N. I was prepared to change the neutral safety switch. This evening, in either position, no cranking at all. Lights, radio, etc. all work, but no starter cranking at all. I checked battery voltage and it read fine. Could this have anything to do with my OVP? I seem to recall someone mentioning the OVP could cause a no start situation, not sure if it means no cranking or no starting.
89 300E
Thanks.

macdrone · #2 10-16-2010, 12:48 AM

I would think your NSS just failed completly if you have been starting in neutral because park didnt work.

krjt · #3 10-16-2010, 12:54 AM

Quote:

Originally Posted by macdrone

I would think your NSS just failed completly if you have been starting in neutral because park didnt work.

The P position was good 80% of the time, this evening nothing in either position. No starter spinning. I had this issue before and if you wait a few hours, or days, the crazy thing starts right up as though you were dreaming.

Gilly · #4 10-16-2010, 04:42 AM

HOLD the brake pedal down tight, then put the key in to the crank position and run the shifter back and forth, it might be out of adjustment to the point where it will only crank in gear (reverse or drive), have seen it before.
It's possible that you actually have worn shift rod bushings, might not be the NSS.
Car will definitely crank w/o the OVP. Will RUN without the OVP. Will RUN without the ECU, actually!
Gilly

Cal Learner · #5 10-16-2010, 05:27 AM

Agree with Gilly. The OVP is responsible for a lot of things (and blamed for even more), but not for a no-start or even a no-run condition in a CIS-equipped motor like yours.

Gilly · #6 10-16-2010, 03:53 PM

If the weather is cold enough, you can possibly get a no-start with a bad/missing OVP, as the engine (injection, actually) is tuned to run, even without the OVP or ECU, in a warmed state (because the engineers figure they should tune it to run "OK" with a warm engine instead of a cold engine, which makes sense, why tune it to run OK only when cold, only to have it run like crap once you get it warmed up?). But either way, the OVP has nothing to do with the starter operating.
Gilly

suginami · #7 10-16-2010, 05:16 PM

Quote:

Originally Posted by Cal Learner

Agree with Gilly. The OVP is responsible for a lot of things (and blamed for even more), ....

OVP's have been blamed for hunger in third world countries.

krjt · #8 10-16-2010, 06:22 PM

any way to check the NSS? I don't have a replacement part yet and it may take a few working days to get a part.
I tried to jiggle and shake and tried tried to use R or D to start, nothing doing.

Gilly · #9 10-16-2010, 08:09 PM

Hold the key to start WHILE moving the shifter through the gears. It might only crank in some odd between-gear position. Another helpful test is to have someone watch the reverse lights while shifting through and around reverse to see if they ever come on.
Gilly

krjt · #10 10-17-2010, 02:20 PM

Quote:

Originally Posted by Gilly

Hold the key to start WHILE moving the shifter through the gears. It might only crank in some odd between-gear position. Another helpful test is to have someone watch the reverse lights while shifting through and around reverse to see if they ever come on.
Gilly

Just got back from trying again... held the key at start while moving the shifter through the gate. Nothing doing. No noise, no clicks at all.
When I left it in R and looked at the tail lights, the R lights were on like good soldiers. Could it be my starter?

Gilly · #11 10-17-2010, 05:40 PM

Sure, it definitely could be, wouldn't be the first for sure!

It's a pain to get to, but you'll see the huge battery cable going to the starter, and the smaller gauge wire, which is the crank signal to the solenoid. In crank position you will get battery voltage on that smaller wire. If you get the voltage, the next logical thing would be to assume the starter is bad.
Gilly

krjt · #12 10-19-2010, 07:56 PM

Mechanic found juice at the starter, so replacement starter installed. Car starts but only in N and not P. So bushings going in next to see if it helps the NSS... still pending.

Gilly · #13 10-19-2010, 09:53 PM

The car only SHOULD start in Park or neutral, what's the problem?

Gilly · #14 10-19-2010, 09:54 PM

OH Neutral and NOT park, got it. Could just be the NSS adjustment too. Not hard to see if the bushings are shot.

krjt · #15 10-20-2010, 11:16 AM

Hopefully the bushings will keep the NSS stay in proper position to work in both P and N.
I was told the Bosch rebuilds were problematic, so he installed some other brand.