What happens if I unplug the upshift delay solenoid on my 300E? - PeachParts Mercedes-Benz Forum

pawoSD · #1 04-04-2010, 01:15 AM

So, the upshift (keeps it in 2nd until it warms up a bit) delay on my 300E is annoying, I just realized while under it today that there is a nifty little tube that comes out of the tranny, into a solenoid, then back into the trans. It has a cable plugged into it.....so....if I unplug this, no more upshift delay, but will it make the car computer angry? I already have a permenant check engine light/code 12 since I disabled the EGR on the car, but will unplugging it cause any other issues aside from an extra code? It'd be nice to have it drive without the emissions nanny....

johnathan1 · #2 04-04-2010, 01:41 AM

I thought that was in place to protect the tranny? Didn't think it was emissions related.

JohnM. · #3 04-04-2010, 02:02 AM

The upshift delay should only affect the first one or two shifts, in a properly functioning system.....it's primarily to warm up the CAT faster.

lee polowczuk · #4 04-04-2010, 02:06 AM

it only effects my tranny for the first minute or two... and only in the 95....not the earlier models that we own

pawoSD · #5 04-04-2010, 02:09 AM

Quote:

Originally Posted by JohnM.

The upshift delay should only affect the first one or two shifts, in a properly functioning system.....it's primarily to warm up the CAT faster.

It does only affect the first one or two shifts, but it is still annoying.... Plus, I am going to do away with the cat anyways in the next week or two. It is rattling at higher RPM and is probably toast inside anways....and I am sure as heck not spending oodles of $$$ to replace it. I'll go euro style.

I'll try unplugging it sometime soon and see what happens.....

pawoSD · #6 04-04-2010, 02:10 AM

Quote:

Originally Posted by lee polowczuk

it only effects my tranny for the first minute or two... and only in the 95....not the earlier models that we own

Nope, 1990 onward have this......the M102 cars did not....but the M103 ones do.