DII throwing codes

[KalahariNik]

Hello folks,

My 2002 D2 with 88k miles on the original motor has been throwing codes for sometime now. Codes originally appeared to be related to bad spark, etc. (misfires) so I recently had a rover specialist change the plugs (bosch platinums) and wires (the good STI wires) and the truck was running well. Well now, maybe 400 miles later, codes are back.

I've been using a wireless OBDII plug in and an app on my iphone to read the codes and this is what I'm showing:

P1300
P0304
P0307
P0300

So I've read that this code cocktail could be the MAF, crank position sensor, throttle position sensor, coils, and about a dozen other causes.

Where should I start?

 

[mbrummal]

change the spark plugs again and don't use the Bosch platinums.

 

[KalahariNik]

What are the odds it's that simple?

 

[discostew]

change the spark plugs again and don't use the Bosch platinums.

Those plugs do suck .

 

[discostew]

I don't think that looks like a mass air flow sensor . If you reset adaptions and it runs like shit , that could be a mass air flow sensor .

 

[KalahariNik]

So start with the plugs and go from there? Which plugs should I try next?

 

[riceybean]

NGK V-power BKR6E-11 or the GP plugs BKREGP, try those then I would look at the CPS if that doesn't clear it up.

 

[KalahariNik]

Alright, I'll give those a go next.

 

[jymmiejamz]

Genuine plugs. I've seen aftermarket plugs cause a lot of misfires, especially Bosch plugs.

 

[KalahariNik]

Genuine plugs. I've seen aftermarket plugs cause a lot of misfires, especially Bosch plugs.

Jymmie,

Pardon my ignorance, what are the genuine plugs?

 

[KalahariNik]

This them? http://www.amazon.com/Champion-RC11PYPB4-Double-Platinum-Spark/dp/B002VVIQHA

 

[KalahariNik]

I forgot to note that putting around town < 35 mph, no codes...but somewhere between 35 and 50 (like when coming up to freeway speed) is when the CEL comes on.

 

[jymmiejamz]

Jymmie,

Pardon my ignorance, what are the genuine plugs?

Ones that come in a Land Rover box and are probably double the price of normal plugs.

 

[seventyfive]

I forgot to note that putting around town < 35 mph, no codes...but somewhere between 35 and 50 (like when coming up to freeway speed) is when the CEL comes on.

...because you are having a heavy misfire under load. Could be just ignition, but since it's a rover it can also be several reasons.

First, don't go to a rover 'specialist' that uses Bosch products. Bosch products even from the dealer are terrible.

These engines need plugs for fat mixture The over priced champions or an NGK 5553.

Could be losing fuel pressure under load and causing lean misfires.

 

[JohnB]

Genuine plugs. I've seen aftermarket plugs cause a lot of misfires, especially Bosch plugs.

Only someone who works at a dealer would suggest this. Just ridiculous.

 

[jymmiejamz]

Only someone who works at a dealer would suggest this. Just ridiculous.

Bosch is probably a better option.

 

[bendts]

Is it the Platinum Plugs in general that don't work as well or just the Bosch ones?

"These engines need plugs for fat mixture" - never heard that term before - does it mean a too Rich mixture, or...?

 

[KalahariNik]

I have Bosch platinum +4s in the truck now. I ordered two types to try: http://www.amazon.com/gp/product/B00BMU8RB6/ref=oh_aui_detailpage_o00_s01?ie=UTF8&psc=1 the V power NGKs and the cheaper http://www.amazon.com/gp/product/B000A8OVPC/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

Also ordered a crank position sensor and MAF for good measure. I suppose if I don't need them, at least I have them.

Will report back on what happens.

 

[ChrismonDA]

Stop overthinking this. This is an 50 year old small block Buick 215 CI V8 that Rover purchased in the early 60's. Very simple easy to work on I have used Autolite plugs and Champions, never had any issues.

http://en.wikipedia.org/wiki/Rover_V8_engine

 

[agthird]

x2 on the autolites....