89 W126 EHA Valve Replacement - SPEED Problem car will not go over 30mph
 

WITH out warning one night my car 89 420sel 161000 miles decided to give me a little holiday suprise when stopped at a red light making a left. I hit the gas, and it sputtered and barely made it to 25 mph. The highway is a 55mph + road, so I parked it at a strip mall.

Lately I noticed a gas smell, we searched and searched, took off the air manifold and saw that something near the fuel distributor was wet. Sure enough it was gas. Searched around on the internet, and found that it could just be the seals, replaced those, returned and bought the unit.

I bought the unit, replaced it... I DID NOT unhook the battery... Forgot... It fixed the leak, but the car still will not exceed 30 - 40mph?

So again... poked around on the internet and saw a post that some units had the wiring backwards. Is this my problem? Will it fix the 30mph?

I am confused.

One more thing.. There does not seem to be a problem when the car is in neutral, but in drive it sputters? Do i need to take the battery cable off and reset the computer?

Not sure I understand the first part of the Subject Field - EHA Valve Replacement?

Will of course require a proper diagnosis.

I wonder if you Catalytic Concerter is plugged?

I replaced the EHA hoping it could not only fix the gas smell, but the power loss as well. I figured if the gas going to the engine was not suffecient, then that had caused the power loss. I replaced the unit, and while the gas leak as stopped, the power loss remains the same.

Assuming EHA work was done by-the-book.

Baum Tools -> EHA test harness - #102-0463

Baum Tools | Audi , BMW, Porsche, Volkswagen, Mercedes, VW, Jaguar, Ferrari

we just opened the hood and switched the unit out

the eha can't leak enough fuel to cause a running problem. i imagine, without looking under the hood, there's another problem. never seen an eha cause any running problem. unplug the ecu and see how it drives. it should do as well, or as bad, with the ecu, etc. working. if it's better, then you DO have an electrical/fuel control problem-i doubt it. if it's the same, then you get to look some more. good luck, chuck.

Ive seen a bad ignition coil cause a similiar problem, easy to check , spark
should be nice blue not yellow, and should jump a 1/4 gap

Thanks Ill give this a go... She was running beautifully... But the "Bessie" (420's name) just had to throw us a holiday surprise...