My 01 Disco IIwill barely run. I have an Actron CP9180 scanner and got the following:
[ul][*]P1300 - Mfr control ignition system or misfire[*]P0303 - cylinder 3 misfire[*]P0305 - cylinder 5 misfire[*]P0302 - cylinder 2 misfire[/ul]
As all of these are on one of the coils, I cleared the codes and replaced the coil. I still barely run and got the P1300, P0305, and P0302 again.

Any advice is appreciated.

Paul

 

How many miles on the truck, have you replaced your plug wires yet?

 

Mike,

Background-

The original engine blew at 101k (my fault - another story) so I put in a new 4.6 short block, reman heads, camshaft kit with slight lift, new rocker arm assemblies, Magnecor 8mm wires, double platinum plugs...

It started up just a little rough and ran at higher idle for a few minutes and smoothed out (pretty typical start up behavior), after a couple of minutes the rpm dropped and it ran fine for another minute or so. Then it started running really rough to the point it wanted to die. I read the codes and then pulled the four plugs associated with the coil - they were physically wet and reaked of fuel. I did pull a comparison plug which seemed a bit carboned for a new plug but was not wet and did not smell like fuel. Replaced the coil and the 4plugs and then fired it up again.

Reading more of the threads and the manual after I posted last night (new member) I am suspicious that I may need the crank sensor "adaptive values" programmed (moved over from old engine).I may also need to drain the fuel and put in new as the truck sat for almost 10 months while I pulled together the cash and then did the work.

Thanks for reading this,
Paul

 

Well, you need to drain the fuel for sure, if not you will really have issues.
As for the crank sensor, most people install new sensors and never need to reprogram them.
Boy, I don't know where to go past this.
Let me know how it goes, what you do and how it turns out, I am curious.

 

is the MAF you are using from the 4.0? is there a difference between the 4.0 and 4.6 MAF. that motor with more cubes and a little lift is probably moving a considerable amount of air over the stock 4.0. maybe the comp can only compensate for a little more, maybe not that much. just speculation..

 

I think that there is a small difference in maf's. I think that the 03-04 maf is slightly larger. I see that they sell them as different sensors and AB once gave me the wrong one. It looked the same, just bigger diameter and wouldn't fit. Seems like you would need a whole new intake too though.

 

well that would be true, i would try to find out if the two diff maf's have two different ranges for metering the air, not just the cosmetic difference in size.

 

Update - the Disco lives!

This vehicle sat for months while I saved up and then did the work - apparently during that time the fuel deteriorated. I pulled the cover and completely siphoned the tank. It took a little while to work the new fuelthrough the system but the enginestarted smoothing out very quickly.I had to clear codes several times due to occasional sputter, but after about 10 minutesnocodes returned.

Paul

 

Well, I apparently jumped the gun with the last posting. The codes returned with a vengeance when the temperature dropped, and then I realized that I only had them on cold start. Once warmed up, they went away and didn't get them with a hot, or even warm, start. Starting to think compression problem, ie warmth swells everything and closes problem and then when it cools, problem returns.

Did compression test and about cried - 1 and 4,6,8 at about 170#; 2 and 3,5,7 at 25# or less.... I'm depressed - this is a NEW short block, rebuilt heads, cam kit, new rocker shaft assemblies, etc., with less than 500 miles on it. I'll start breaking it down tomorrow.

No coolant loss, oil is perfect....

 

Very strange configuration on your compression loss. You have no.1 on the left and no.4,6,8 on the right side with compression and then symmetrically the opposite for no compression.

Check and see if your timing chain is off one tooth.

I do not think that you have a problem with your cylinder heads.

This looks like cam timing.