2001 Disco 2.
200,000 miles


Head gaskets done two years ago, new lower intake gasket, timing chain, etc..
Last year new crank sensor and new MAF.


Recently the car started running poor. Random misses, sporadic but not terrible.


Now, as of last week, the thing barely runs. When stepping on the gas pedal the check engine light starts flashing and there is a steady miss.


I am getting codes:
P0305
P0307
P1300


We used to get codes 1174, 1175 but those codes no longer display.


Now I know what 305 and 307 are. Misses for those cylinders. What is 1300?


I changed the spark plugs. I noticed plug 8 (pass side) had some slight black color and some soot. Plug 7 ( drivers side) had a good amount of soot buildup. Not charcoal looking which would appear to be oil, but black soot, as in air fuel ratio.


No real change, still runs poor, although it is slightly peppier.


I have an Ultra Gauge.


Now since the last few months, the cruise control quit, also the brake pedal goes down quite a bit.


I did do a compression test, all cylinders are between 110 and 120, so to me that eliminates any cam lifter issue.


Next week, I have drill this weekend, I am doing the following:


Smoking the engine to test for any vacuum leaks.
New lower intake gasket.
New coil packs.
New STI wires.
New fuel injectors.
New air cleaner. (Due although not restricting)
I might check the timing marks.


I am getting a squeak from the front drive shaft area, so I bought another one of those too. Easy swap.


Brakes will have to be looked at to figure out what is the issue, master cylinder or pads, or both .


I do have a snap on solus, but the land rover software isn't loaded so I have to use the global OBD which isn't really helpful.

Will the ultra gauge help me diagnose any issues, such as, O2 sensors being bad, fuel pump etc? What do I look for?


Where would you guys start?


How can I tell if the computer is going bad?


I am hoping for a vacuum leak, as that would be easy, but don't really know.


Could it be one of the sensors, o2 sensors, new MAF etc.?


I figure I'll let this thread run till next weekend, then start doing the things you guys mention and go from there. This week Ill build my smoke machine and get everything ready.

 

1300 is saying multiple misfire I think. Which is obvious from the other two. But there you go.

5 and 7 are next to each other, drivers side rear, so a HG leak between those two could be suspect. Not what you want to hear. (Thinking, if you had a gasket leak between two cylinders, you would still maintain decent pressure. As long as the leak wasn't to atmosphere.)

Or simply wires in that region, both damaged? Have you checked for arcing in the dark?

5 and 7 are different coils, so that's unlikely, IMO.

 

I used a harbor freight wire tester and it did seem not as steady as the other cylinders.


But, I have no foam in my oil, and no oil in the anti freeze.

 

I guess if you will do the all following, youll have a better chance that those codes will be gone. P1300 is a Catalytic damaging misfire, this could be due to a really bad multiple misfires. Since you are changing to new injectors too, the P1174 and P1175 could also disappear. If those are not corrected in time, you will end up replacing your catalytic converter. Looking at your millage, this could happen.

 

First things first. The misfires. Don't panic. The coils on these trucks seldomly fail. Since you already installed new plugs I'd do the wires next and see what happens. STI is a good choice. As cappedup suggested check for arcing by watching the 5 & 7 cylinder area with the truck idling after dark.

 

My money is on coils and wires. For something like $40 for a new set of coils, I was happy to swap mine. I had a similar issue, inside of a plug wire was fried in the coil connector.

After you get that done, you might need to get new cats. I am having 2 new Magnaflow 94105 welded on tomorrow. $75 each cat plus $85 per cat to install so $320 for everything. I hope to get $200 to recycle the old cats.

Keep us posted. Be sure the new plugs are gapped to .040 IIRC.

 

To check for a leak between the two cylinders just pull the spark plug for one and pressure test the other. If it leaks down that way then that's you're issue. If not then its not. If it is, that's a BIG issue which will erode the cylinder head as well as the wall between the two cylinders and if left long enough could lead to completely ruining your block and head. That's what happened to my parts truck between those same two cylinders.

 

I put codes from the Rave into enginecode master

http://enginecodemaster.com

Good luck.

 

How to tell if the computers bad?

 

New code 0130


I still haven't touched the Rover, I will this coming Saturday, just gathering info.


Wife says now it backfires.


Gas mileage is about 6 miles a gallon. Cant go much faster than 30 without the engine running bad and the CEL flashing. She isn't driving anymore...wont have time till Saturday though.