Rough idle and engine stutter....

V

vinman1369

Member
May 27, 2004
20
0
46
East Northport, NY
I have a '99 Disco 2 with 78k miles and the service engine light has been on for a couple weeks, just yesterday it started blinking, the engine started idling rough and stuttering when I give it some throttle. I got the codes read:

P0174 - System too lean (Bank 2)
P0300 - Random misfire detected
P0301 - Misfire in cylinder 1
P0305 - Misfire in cylinder 5
P0306 - Misfire in cylinder 6
P1300 - Manufacturer control ignition system or misfire

Any suggestions???
 
Chris-St Louis

Chris-St Louis

1
Oct 27, 2004
3,000
4
o2 sensors are working fine. They are telling the car that there is a misfire and the engine is lean, and

as proven by the BLINKING Check engine light


That the cat is being overwhelmed and melting.


My Bet, stuck open injector.
 
Chris-St Louis

Chris-St Louis

1
Oct 27, 2004
3,000
4
Not sure. Not enough details. But, the fact the SES light was flashing lead me to think injector overfueling.
Only one bank was lean, it is possible to have a injector leaking on one side, and a lean condition on the other side.

Flashing SES lights are, in my experiance, stuck injectors
 
Chris-St Louis

Chris-St Louis

1
Oct 27, 2004
3,000
4
Series 2 Discos are a hassle to get the injectors out of.

What I would do is connect a fuel pressure gauge to the fuel line. Turn the key to number 2 and pressurize the rail. I don't remember off the top of my head but I'll look up the number of PSI your looking for.


But, what your REALLY looking for is bleed off. After it's pressurized, turn the key off and watch the instrument. If a injector is leaking, the pressure will drop.

That isn't the only cause of pressure drop. A bad check valve in the pump could cause it too, but the symptoms would be a Long Crank On Cold Start, not a misfire code.

If the pressure bleeds off, Take out the fuel rail with the injectors still attached, adn pressurize---turn off again. Watch for fuel dripping.


ANY




ANY



ANY fuel dripping is a failure. Best bet is to replace all 8 if one is bad, just so you don't have to do it again.


This is where working in a well equipted shop is helpful.


I worked at a shop with a borescope. Same check involved taking out the spark plug,stucking it in and watching on the Monitor.


That easy to get used to. :)
 
B

brianpack01

Guest
Please Help!

I have the same problems with mine....bank 1 and bank 2 are running too lean...It says the engine is misfiring....but no indication that it is. Wouldnt the engine run much much different? The only problems I am having is knocking..low idle...sick feeling gas pedal...I cleaned the MAF and the light disappeared..ran better...then, the light came back on...same issue
 
S

Silly_me

Well-known member
Feb 20, 2005
95
0
My 97 D1 was acting like this (though it didn't send a flashing CEL, but my CEL runs constant 24/7 :D ).

Turned out the plug wires were rusted at the boot and were only making intermittent contact with the plugs. Fouled the plugs up as well.

Just a (cheaper) thought.
 
B

brianpack01

Guest
sensor

Is there only one MAFS on a DII? If so, where is it. Where to get it? Thanks. I hope I find it in one loss.
 
B

brianpack01

Guest
Mafs

Right....For some reason I had a brain fart....I tryed cleaning it again last night...no change. I thought it ran better when I had cleaned it about a week ago. The light went off. Would this be causing it to run lean though?
I really appreciate it. Thanks
 
A

andrewv

Well-known member
Apr 20, 2004
1,341
0
39 14' 18.31" N 106 50' 34.02"W 8,545
My thought was that when you cleaned it the first time, things got better for a bit, then went back to shit. Cleaning the MAFS as a permenant solution really only works less than half the time. Yes it could be causing your lean condition.
 
B

brianpack01

Guest
Maf

alright...ill replace it and let you know. I appreciate it. Thanks.
 
M

mainerova

Well-known member
Mar 12, 2005
635
0
43
Poland, Maine
Chris-St Louis said:
Series 2 Discos are a hassle to get the injectors out of.

What I would do is connect a fuel pressure gauge to the fuel line. Turn the key to number 2 and pressurize the rail. I don't remember off the top of my head but I'll look up the number of PSI your looking for.


But, what your REALLY looking for is bleed off. After it's pressurized, turn the key off and watch the instrument. If a injector is leaking, the pressure will drop.

That isn't the only cause of pressure drop. A bad check valve in the pump could cause it too, but the symptoms would be a Long Crank On Cold Start, not a misfire code.

If the pressure bleeds off, Take out the fuel rail with the injectors still attached, adn pressurize---turn off again. Watch for fuel dripping.


ANY




ANY



ANY fuel dripping is a failure. Best bet is to replace all 8 if one is bad, just so you don't have to do it again.


This is where working in a well equipted shop is helpful.


I worked at a shop with a borescope. Same check involved taking out the spark plug,stucking it in and watching on the Monitor.


That easy to get used to. :)
Click to expand...


What, if any preventive maintenance can you do for this???
 
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