Saijin_Naib

Okay, my 300ce is giving me issues. From what I have read so far here it sounds like it could be one of these many things:

1)OVP (thanks shadow)
2)Fuel Pump
3)Fuel Pump Relay
4)Mass Airflow Sensor
5)O2 Sensor

Symptoms:
Sometimes car wont turn over, no matter what. Usually resolved by waiting (or charging/jumping the battery, though its only a year old).
Once the car cares to turn over, it will do one of two things:
1)drive away like nothings wrong
2)studder and stall and ****/moan

If it does 1, it will start to do 2 shortly after, usually a minute or two into driving. This studder/stall behavior is usually accompanied by the fuel gague going wonky. This is typically demonstrated by the gague flicking from current fuel level to reserve, back up, somewhere inbetween etc while the car is on the fritz.

My dad and I are going to take some time to poke around the CE this weekend, and I dont want to be throwing parts (or other things if I get pissed) at it, so if anyone has any suggestions of where to look first, I would be eternally grateful.

Thanks homos

ZorroAMG

Start with cap and rotor and possibly new oem plugs...that helped my stutter/stall/rough idle issue...

Saijin_Naib

My dad did cap/rotor/plugs last time it did this, about 3-4 years ago. Can they get buggered that fast?

He put in all new cap, rotor, plugs (OEM), ignition wires, OVP, and ignition transitor. Or transitorized ignition module. or something to that effect.

ZorroAMG

Yeah, check the contacts on them....it's a cheap fix...

Saijin_Naib

Contacts in what?

ZorroAMG

cap.....

Saijin_Naib

Sorry my dad does the car work, I just watch and try to be helpful.

ZorroAMG

It's the dark orange part....has 6 contact points...

shdoug

It sounds to me like you're losing 12 volts to the ignition system intermittently. Definitely examine the OVP. I believe it supplies power to most of the ignition and control system. Also check all your fuses. I don't think the cap and rotor (wait, don't you have the early M104, HFM engine?) would cause the gas gauge to lose power. It sounds like a simple problem, but may be tricky to pinpoint. It might even be the ignition switch contacts. Try turning the key slightly to the left when it acts up and see if it changes anything.

Saijin_Naib

Not sure if I have HFM or CIS-E. I think I am CIS-E because its the 24v I-6 m104 with 212hp and 200+ ft/lb of torque. I will check what both of you reccomended

Thanks!

Saijin_Naib

Okay, its the CIS system. Not sure what to be specific.

So today, we took a look at the OVP (thanks shadow ) and the fuses tested fine. Next, we took out the MAS unit and cleaned the contacts, remounted it. Seemed fine. What is the box between the MAS and OVP behind the battery?

Next up, my dad took out the airbox and cleaned the throttle body to be sure it was not sticking.

Final step, turn the car on. Worked wonderfully for a while, then just ****ted out. Turns out that the fuel pump is pumping but stopping, leaving no unburnt gas in the tail-pipe when we cranked it to try and get it going again. Also, no fuel was felt going down the line from the fuel pump when we were cranking the car.

So what does this mean for us? Bad fuel pump, bad fuel pump relay? Or both?

Thanks!

ZorroAMG

Bad Owner.

Saijin_Naib

Thats all you have for me?


I guess you cant be awesome at everything

shdoug

For what it's worth, a bad fuel pump usually doesn't just stop once it's already running. I would replace the relay if it were my car.

Saijin_Naib

Ahh okay. Thanks. Is there any way to test the relay to be sure its the culprit?

More to the point, where is that relay?

zjamiez

The Relay is behind the batter, small black box with 6 cyl written on it, before you you can jump two of the pins to run the pumps, cant remember which ones though.. I just took my relay to bits and normally the solder goes on one of the points. Just resolder it and test again!

Saijin_Naib

^ Thats it? We dont necessairily have to replace the whole thing?

Sweet

I will try and test it out later today

Saijin_Naib

Okay. I need this confirmed. I see nothing around the battery that says 6 zyl or 6 cyl on it. I have read elsewhere that the Fuel Pump relay is integrated into the MAS. Is this bull**** or what? I have the MAS pulled right now and all thats left is the battery, the OVP, and another box with writing on it straight behind the battery if you are looking at the car dead on. wtf am I looking at here? I want to get the fuel pump relay out of the car like now, so I can get it re-soldered by a repair shop.

Help!!

Saijin_Naib

*** it guys, Im going with it. Im off to the repair shop now to hopefully get it fixed. I cant afford 300$ for a new MAS right now. Especially not if we dont get the 400e sold and my knives sold.

Saijin_Naib

Well, they wont touch it. They dont know how to open it. So I guess its up to me to figure this ish out now :C

Saijin_Naib

Can anyone tell me how to service the MAS?

I cant figure it out

YNVDIZW124

They don't know how to open the hood? WOW!!

Saijin_Naib

Nah, electronics repair shop. I drove the 400e there with the relay in hand to show the guy what needed to be fixed.

Dealership wants 500+ for the MAS.