4XFORE

Paging Ohlord or anybody .... MAF for 1998 e320 and MAF for 2000 e320 are they the same? TIA.

4XFORE

my CEL went on and the car went to limp mode and i made to the next exit.
notice the car's idle is somewhat rough.
6 Codes;
P0400 EGR flow ...
P0303 cylinder 3 misfire
P0302 cylinder 2 misfire
P0301 cylinder 1 misfire
P0300
P0110 IAT sensor circuit mulfuntion

would this be a bad MAF?
that's why i asked if 1998 and 2000 e320 MAF are the same
because my buddy will let me try his 2000 MAF

RichardM98

Yes they are the same.

If your friends MAF clears the problem, you might want to get some CRC MAF cleaner (Pepboys, et al) and try cleaning. Poster gregs210 did a nice DIY on that.

If you need replacement, get germanstar insert or autohausaz unit. eBay units are cheap for a reason.

Good luck.

4XFORE

Thank you. I hope it's just a shot MAF. I will try his MAF and I will post the
results later.

4XFORE

my car still giving me P0303 cylinder 3 misfire, P0302 cylinder 2 misfire and P0300 random/multiple cylinder misfire detected after putting on a know good MAF from my friends car. Still in limp mode. Rough idle. what to check next? Help Please.

RichardM98

Check your catalytic convertors for plugging. Strike them with the heel of your hand and listen.

4XFORE

plugging? i did both of them and it sounds pretty solid? i'm not really sure what to listen to?

RichardM98

Some times as the catalyst breaks down into pieces they rattle against the sides and each other if the convertor shell is struck.

Normal checks for a plugged convertor are measuring engine vacuum or doing a back pressure test. Both point to a too low flow in the convertor and elevated temperature. I don't know the vac spec for our engine but most cars are up around 20" Hg.

4XFORE

So possible plugged convertor will give me these codes and put the car in limp mode home? It seems like the same codes which put me to cylinder misfire 3,2, & 1 plus multiple cylinder misfire. Are these cylinder all in one side and which side? I'm trying to narrow down the problem.

RichardM98

Yes. Starting at the front right (passenger) side 1-2-3 front left side 4-5-6.

4XFORE

How many converters total? 2 in front and 2 in the midle? I will re-check again. Anymore possibilities what to check? What would be the price range for the converters and options on what to purchase? Thank you again for all the help.

hineywineries

Had you given any thought to taking it to a service facility and have it diagnosed by a professional?

4XFORE

i'm about to but one last chance. here's the update on what we've done so far and the car still not in working condition.
MAF
Plugs
Wires
Switched Coils
Switched both O2 on one side. (we intalled O2 from a known good car)
Checked CAT no rattle
OBDII still giving us P03001, 3002, 3003, which is all cylinder missfire on same side. (cylinder 1, 2, 3)
What else could it be? Ohlord? Richard? Anybody? Before I tow the car to my indy guy. Tnx.

kbad

the whole MAF housing - including the sensor?!?!? the MAF is specifically designed for that housing - unless you duplicate the housing and how the sensor sits within it exactly, you will receive errors...if the housings/sensors are identical, then no worries.

on my 2001 e320, the MAF housing has a 3" i.d. - the stock MAF used to be 2.5" i.d., and the TB was bored to 68mm on M112 engines from 2000 and on - not easy to tell, unless side by side (see picture, not mine, i don't have a 2.5" MAF to compare for you) but it will make a difference if you are using your buddy's MAF in your housing and they are not the same size of housing and sensor offset/directionality!

you said that, you "notice the car's idle is somewhat rough," the first time with your original MAF. how did it react with your buddy's MAF? (e.g. small sensor/large housing will make your car buck and run lean).
<!--[if !supportLineBreakNewLine]-->
....with that said, you may want to try a MAF for yours if they don't share the same MAF and that may be the original culprit?!?! ...or, try your MAF in your buddy's if they are the same and see if that works.

Good luck!

ohlord

this thread till today.
Clear the codes,see what comes back.
None of those indicate maf except the IAt.
The P0400 if it returns could be the issue.
Did you clean the egr tube?
That or a bad cat




And yes the MAF is the same.

4XFORE

the CEL and run and check again. code are still
p0301, 302, 303 misfire cylinder 1,2, 3 and 300 multiple misfire.
car will start right up but now it really idle rough. maybe it' been
sitting there for a few weeks now?

i did not clean the egr tube yet though. i just wish that there's a good
way to test the cat with out cutting the tube. Would this be really pointing me to a bad CAT? passenger side only.

(what's the chances of a bad ECU?)

ohlord

would be very rare.
Don't worry about that.
You can test the cat without cutting it.
call, we can discuss

4XFORE

pm sent

4XFORE

i sent you an email and PM. not sure if you got it. waiting for your reply.

4XFORE

especially to ohlord and richard! we took out the whole pipe from the passenger side 2 bolts after the header and 2 bolts before the muffler.
1 bolt holding the 2 pipes together and 2 bolts right after the 2nd O2. removed the front sway bar for easy access. (need to slide the pipe forward)
car starts and rev like a champ again with no hessitation

plugged cat! we'll order it monday.

kbad

good to hear you got that sorted out.... one question....was your cat acting up at all prior to this (i.e. rattling or other noises that suddenly went away - but after a while)? ...maybe two... did you bang the old cat and see if it would loosen what was plugging it (honeycomb guts i assume)? ....and...which cat was it; do 98s have quad cats as well?

4XFORE

of the CAT. passenger side. ordered new one today.

ohlord

CARB version,Right?

4XFORE

my friend ordered it for me (OEM) from SF something parts house. (european)

4XFORE

the new cat today. car now runs great again
now! after driving a few miles CEL back again with
P0400 EGR flow malfunction. car still runs great even
with the CEL. we'll try to clean the egr tube.