need help with CIS

[DPW928]

Airtek,

Boises problem was the engine ran alright when cold but went lean as it warmed up. From reading your thread, your engine is starting with fuel from the cold start valve but you are getting insufficient fuel to the injectors to keep it running. My guess is that the metering slits in the fuel distributor are plugged with varnish from the old fuel. Try spraying injector cleaner through all 8 injector outlet ports to see if this improves the fuel flow. This may also clean varnish out of the distributors central cylinder which would cause the metering piston to lock.

[Jadz928]

Originally Posted by MPDano

In short, you'll see another one of our members here did the exact same thing using a MB Fuel Disty that was adjustable. He fought it for months trying to get it running right until he finally listened to us to get a stock one. Guess what? He got a stock Disty and it actually ran as it should. Who woulda known?

I think that was a good approach. Having the individual adjusment per cylinder only exaserbated the situation on an engine that wasn't fully in-tune to begin with.

I would use a MB style FD only an an engine first properly tuned w/a stock FD. Following that, would add in the MB FD, adjust system pressure equal to what was there before (in-spec.). Lastly, perform individual cylinder A/F tune.

In short, not for the faint of heart, but totally doable if systematic in process, while keeping variables to an absolute minimum.

Def. not the right thing to do if the engine isn't running, or running right to begin with.

[MPDano]

Originally Posted by Jadz928

I think that was a good approach. Having the individual adjusment per cylinder only exaserbated the situation on an engine that wasn't fully in-tune to begin with.

I would use a MB style FD only an an engine first properly tuned w/a stock FD. Following that, would add in the MB FD, adjust system pressure equal to what was there before (in-spec.). Lastly, perform individual cylinder A/F tune.

Exactly. Right now, I "know" all my CIS components are functioing as it should and the car runs great. Now would be a time to throw on a MB Adjustable Disty just to see if I can gain performance. Except, I won't

[AirtekHVAC]

lol...why not???

[AirtekHVAC]

Dennis....good idea....When the injectors arrive (I hope tomorrow!) I will take loose all the lines at the FD, and blow through before I reconnect to the new injectors...will also clean or remove the little screens on the FD and WUR (cant play any tonight...it is VD)

[DPW928]

Also, remove the fuel regulator off the back of the distributor, check the o rings and spray injector cleaner into the ports. It's possible the regulator was stuck open letting system pressure bleed back to the tank. BTW don't remove any spacers/washers on the regulator as they are factory set.

[MPDano]

Originally Posted by AirtekHVAC

lol...why not???

$$ and time. Plus, the Euro needs a new Tranny.

[AirtekHVAC]

I'm with u on the $$ and time...I seem to lack both as well...

[AirtekHVAC]

Dennis, when I pop the gas cap off, there is a sucking sound...so it does not appear to be pressurizing.....

[DPW928]

There shouldn't be a vacuum in the tank if the lines are clear. You may want to check all your lines and inlets/outlets at the top on the fuel sending unit and between the fill tube and the back of the tank.

[gbgastowers]

Originally Posted by MPDano

In short, you'll see another one of our members here did the exact same thing using a MB Fuel Disty that was adjustable. He fought it for months trying to get it running right until he finally listened to us to get a stock one. Guess what? He got a stock Disty and it actually ran as it should. Who woulda known?

That's me. I wasted countless hours and energy trying to tune that MB fuel distributor and make it work thinking it was an upgrade. As soon as I ditched it and got the FD that was supposed to be on the car it ran perfect.

[AirtekHVAC]

Huh? Oh boy...I'm screwed now! No wonder it ain't working!!!!




Dennis, perhaps it is air escaping, not sucking....?

Gunnar...right? From the pharmacy? I need to drop in on you one day....

[Jadz928]

Originally Posted by gbgastowers

That's me. I wasted countless hours and energy trying to tune that MB fuel distributor and make it work thinking it was an upgrade. As soon as I ditched it and got the FD that was supposed to be on the car it ran perfect.

Gunar, do you still have the MB FD? Would you like to part w/it?

[gbgastowers]

Originally Posted by Jadz928

Gunar, do you still have the MB FD? Would you like to part w/it?

No- after I pulled it I sold it on ebay to someone in Thailand. Gunar

[gbgastowers]

Originally Posted by gbgastowers

No- after I pulled it I sold it on ebay to someone in Thailand. Gunar

This was the buyer.

[AirtekHVAC]

LMAO!!!

Jim, I got a buddy that owns a junkyard...I'll see if he has an old V8 benz lying around...may not, but ya never know...

[Jadz928]

Originally Posted by gbgastowers

This was the buyer.

That's awesome, Gunar! lol

Originally Posted by AirtekHVAC

LMAO!!!

Jim, I got a buddy that owns a junkyard...I'll see if he has an old V8 benz lying around...may not, but ya never know...

Thanks, Bro!

[MPDano]

Originally Posted by gbgastowers

That's me. I wasted countless hours and energy trying to tune that MB fuel distributor and make it work thinking it was an upgrade. As soon as I ditched it and got the FD that was supposed to be on the car it ran perfect.

Gunar! Where ya been? Hows the 928 doing?

[AirtekHVAC]

Just talked to my friend...he knows he has an old benz in the yard, and some volvo's...does not remember if they are v-8's or not, he said he would try to check today...

[DPW928]

Airtek,

If you get an MB distributor, you will need to adjust the A/F mixture with the adjustor on the upper plenum due to the different geometries. The A/F mixture can be adjusted without the engine running.