rough running
 

Before changing oil, I dumped some Seafoam in.
Also put some in the gas tank, appx 1/2 can with a 3/4 full tank
Engine now running rough
Check engine light on
Checking codes I get
P0101 MAF
P0304 #4 misfire
P0305 #5 misfire
P0300 multi misfire

Any simple solution??
I believe that I most likely put too much Seafoam in the gas tank

Re: rough running
 

How many miles on the car? Daily driver or ?

Re: rough running
 

134,000
I can not let suck a beautiful work of art sit, I drive all the time.
Love the stares that it gets.

Re: rough running
 

If you sprayed it into the throttle body, you just need to find an interstate , an jump on it. I left a cloud of suet an smoke for 2 miles. It will clear out.... :rolleyes: And that's not to much in the tank..

Re: rough running
 

Thanks
Guess that I should have mentioned that I have ran 1/2 tank twice
Plus 100 mile on the highway

Re: rough running
 

Aaaaa...now we see. First clean your MAF sensor (special spray) , then a fuel filter. Also pull plugs 4 an 5 to make sure they have not fouled causing them, to not fire when called on.

Re: rough running
 

Is this MAF spray available at a parts store??
Special???
I figured I was gonna need to do fuel filter.
Plugs pain in the a...
Thanks

Re: rough running
 

Yes it is.. right on the shelf with other cleaners and will state "MAF" on the can.. ;)

Re: rough running
 

Thanks
Just used google
CRC had a very good video on youtube
Looks like I know my to do tomorrow after coffee
Thanks all

Re: rough running
 

I see that you have replaced with Needswings plugs and wires. Did you do it yourself or have a shop do it? I'm asking because I have the special tools for that and could let you borrow them if you don't already have. I'll be in your area this weekend(I'm a new grandpa, and will be down in Brentwood for a visit). But hopefully the clean/spray procedure you're going to do takes care of the issue. PM me if you find the need.

Re: rough running
 

Thanks
Happiness on your new status
I replaced myself years and miles ago when I first purchased the car
I am going to follow the suggestions here after coffee.
When you are here still contact me.

Re: rough running
 

Would you recommend using Seafoam?
I personally do not believe they are beneficial, auto makers often specifically say not to use them, anything not in the gas and oil already is probably not required at all.

Re: rough running
 

I am torn on that.
I blame myself for maybe using too much with too little gas.
As far as in the oil, don't know there either.
I am gonna clean MAF today, check plugs order new filter from needswings.
After cleaning MAF, run to see if that does the job.
Then the plugs.
Keep you all posted
Thanks again for all the advice.

Re: rough running
 

Update
Did the spray the MAF with CRC MAF cleaner
No good, won't idle, runs rougher
Letting it sit tonight and retry tomorrow
If no luck will be changing the fuel filter
Appreciate any further ideas
Thanks for the help

Re: rough running
 

Try a throttle reset now as well. It's an easy procedure. May not do anything but certainly no harm and may help. Mine ran rough after using the MAF spray (not bad) but after the reset, smooth as silk.


1. Get in your car

2. Turn the key to the on (not start) position, the position just before the starter
turns over.

3. Press the gas pedal to the floor with the key in the "on" position.

4. Hold the pedal to the floor for five seconds, then turn the key back
to the "off" position (don't remove the key), then release the gas
pedal.

5. Wait 2 mins. for a full alignment.

6. Drive the car as you always do.

Re: rough running
 

BTW realize that under the skin a Crossie is really a Merc R170 and never forgets codes. The official procedure is to record the codes, clear the codes, then see what comes back.


The first time often get many particularly if the battery has been replaced.


BTW I see a number of mods including the MAF. Is it a Bosch sensor ? Did you do anything just before it began ?


BTW after cleaning the MAF they often are hard to start or run cranky for a few minutes, then they usually smooth out.

Re: rough running
 

I would put the original MAF sensor in the MAF body if not already in it. There have been problems running the 74mm MAF sensor, wirth a try I'd say.

Re: rough running
 

PNA
Thanks for the idea
Will try it right after morning coffee
PADGETT and ONEHUNDRED80
Original sensor.
Advice here was to use it

All was fine till I dumped Seafoam in the gas tank.

Re: rough running
 

You had dormant demons in the tank, you woke them up :)
Seriously, you may need to drain and refill the tank.
If you are lazy ( like me ), you could disconnect the flexible line where it connects to the manifold and use a rubber tube connected to it to dump the fuel into 5 gallon cans.
Hook up a battery charger and turn the key on ( not start ) to energize the fuel pump.

( ALL THE ABOVE IS ASSUMING THAT THE FUEL IS THE PROBLEM, NOT SAYING IT IS )

Re: rough running
 

Never say never and since an easy swap, try it but with a dirty/failing MAF I usually see a P0170 and P0173 (fuel trim error on both banks) and does not run rough though MPG may be down.