96 disco idle, misfire problems!!!!!!

[cbrown12]

96 disco idle and popping problems. I got the following codes from autozone: P1313 Misfile likely to damage catalyst, Bank A, P1314 " " Bank B, P1316 Misfire causing excessive misfires, P0303 Cylinder 3 misfire, P0300 Random misfire detected.

I have changed the coil packs, wires, spark plugs, fuel filter, stepper motor and throttle positioning sensor. All to no avail? It runs even badder after it has warmed up, it vibrates and hesitates during as you pick up speed. I noticed that over 40mph when I shift in lower gears that it drives better.

Changed out VSS, a little better but it still hesitates once my LR warms up and I have been driving a while. It starts to pop and hesitate a little.

Also, ran some seaform thru the injectiors and repaired two exhaust leaks. I

Note: Problem had seemed to go away when pulled the fuel cap. Drove the LR and it ran fine. No backfiring or hesitation!

Ofcourse that didn't last long it has started back again , Fuel injectors? Fuel Pump?

Any help would greatly be appreciated!

[John C]

Your cats are glogged, the answer "P1313 Misfile likely to damage catalyst, Bank A"

You probably have some other problems...

[cbrown12]

Originally Posted by John C

Your cats are glogged, the answer "P1313 Misfile likely to damage catalyst, Bank A"

You probably have some other problems...

John,

Changing the cats should be the first step?

[John C]

Tell us more about when you changed the parts, did you change the parts and have the codes read? Did you reset the codes after you changed the parts?

First make sure the TPS sensor is installed properly with no air leaks.

Second, have the codes reset and read again. If the cat code comes up again I would consider changing them. You don't have to spend a zillion dollars on original cats, just get them from Summit Racing for 70 bucks each and have them welded on.

How many miles on the engine?

[cbrown12]

Originally Posted by John C

Tell us more about when you changed the parts, did you change the parts and have the codes read? Did you reset the codes after you changed the parts?

First make sure the TPS sensor is installed properly with no air leaks.

The TPS was installed properly, no air leaks.

Second, have the codes reset and read again. If the cat code comes up again I would consider changing them. You don't have to spend a zillion dollars on original cats, just get them from Summit Racing for 70 bucks each and have them welded on.

How to reset codes? Never did it, pull battery cable?

How many miles on the engine?

1996 SE7 87,000 miles

[John C]

Originally Posted by cbrown12

1996 SE7 87,000 miles

Might be too early for bad cats.

Get the codes cleared and have them read again. Just an FYI, I've used the handheld OBDII code reader from Autozone and you can reset the codes (it's a good investment for under $125).

[cbrown12]

Originally Posted by John C

Might be too early for bad cats.

Get the codes cleared and have them read again. Just an FYI, I've used the handheld OBDII code reader from Autozone and you can reset the codes (it's a good investment for under $125).

I just spoke with a local muffler shop, they can check the cats to see if they are bad or not.

[cbrown12]

Originally Posted by John C

Might be too early for bad cats.

Get the codes cleared and have them read again. Just an FYI, I've used the handheld OBDII code reader from Autozone and you can reset the codes (it's a good investment for under $125).

John,

What model number or size to look for on the cats at summit ?

[disco96]

I think at autozone u can also just borrow the obd read and do it ur self you might have to leave a deposit at some.

[roverX]

CB - Where do you live?? If you are anywhere near Modesto, stop on by - if your rig can make it - or maybe I can come to you. I have a car chip and the software so I can read and reset your codes.
Also, I have two cats for your truck you can have for a 12 pack of Corona. I bought them for my truck (same year & model as yours) but ended up using another set up.
(209) 585-5265
Steven

[John C]

Originally Posted by cbrown12

John,

What model number or size to look for on the cats at summit ?

I think it was CTO 6905 or something.

[01001010]

Hey John, I'll be checkin on that P/N as well, as the rattle from my cats is getting worse and my CHECK ENGINE light is on meaning my o2 sensors might be going kapoot..right?

BTW, if the inlet and outlet dia.'s are 2-1/4 then CTO 6905 is the right P/N

[pavel]

Just a suggestion cbrown 12, but some of your symptoms are very similar to my 96 Disco's behaviour last year. I happened to check the voltage at my 8 year old battery and read only 10 volts. Sure enough, with a new battery all the missfiring and hesitation went away instantly. It all turned out to be a 'starved computer' problem. Hope your Disco can be fixed as quickly (and cheaply) as mine. Pavel.