p0300 on 02 Isuzu Rodeo = RESOLVED

nhromyak · **Joined:** Sat Nov 24, 2007 2:57 pm **Posts:** 5

*sigh*

02 Isuzu Rodeo with 50K miles.
P0300 Multiple Cylinder multiple misfire.

Could this be an exhaust leak in front of the O2 sensors? I pulled exhausts off to get to the transmission lines and starter.

I also changed out the Original Denso's for some Auto-lite double platinums. Still got the code.

I finally got a hold of some Denso's and put those in there. Cleared codes, it (p0300) came back.

I found a leaking O-ring under the intake manifold, changed the manifold gaskets and all hoses (while I was in there).
I unintentially pulled the injectors off while doing the intake gaskets. I did this primarily because of the bolts were in the way.

Could I have gummed up the injectors or messed up the intake gasket for multiple cylinder misfire? I would have thought I would get a lean code.

Any help appreciated.

Havin' Fun in Sacramento.

Nick

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jeff compton · **Posted:** Sat Nov 24, 2007 4:14 pm

are there any ignition wires on that or is it coil on plug setup? Seems to me I remeber hearing something about egr's and Isuzu's but as well check that the fuel pressure is correct, vaccum leaks etc! What engine is in it?

nhromyak · **Joined:** Sat Nov 24, 2007 2:57 pm **Posts:** 5

Thanks for the reply.

I have heard of the EGR getting plugged and causing pinging. I cleaned that out sometime ago and the pinging went away. I changed the fuel filter back then too. IIRC - it was around 11K ago.

This is a V6 3.2. It does have the coil on plug.

BTW: It runs GREAT! I have all the power I want without the "Power" mode on.

It seems to be getting good mileage too.

Also, I noticed right after I cleared the codes, I would get the flashing CEL above 2K rpms. IIRC - this seems to indicate an emissions after power spark issue. But, what do I know?!? That's why I am here.

nhromyak · **Joined:** Sat Nov 24, 2007 2:57 pm **Posts:** 5

I sprayed almost a full can of carb cleaner around the upper and lower (as much as I can) with no noticeable changes to RPM speed.

Anyone?

nhromyak · **Joined:** Sat Nov 24, 2007 2:57 pm **Posts:** 5

Could this be an exhaust leak?

Darkrooms · **Joined:** Thu Mar 29, 2007 9:44 am **Posts:** 1424

Did you know that those spark plugs requre Nippondenso spark plugs? Im pretty sure Ive tuned up a couple of those with aftermarket Bosch spark plugs and received a P0300 randon misfire. The system is very sensitive to any plugs other than Nippondenso. I know it's hard to believe, but it's true.

nhromyak · **Joined:** Sat Nov 24, 2007 2:57 pm **Posts:** 5

YEP, that's why I put the Nippondensos back in.

I FOUND the PROBLEM!!! YAHHHHHHhhhhhh

ugg..

APPARENTLY, the coil packs are specific to the #6 cylinder (drivers rear) vs. all the other coil packs. :roll:

Yep, I put #6 on #3. So now I put them back, cleared codes and I got 4 start cycles with no MIL!

YIPPEE!!!

Thank you all for the help!

Darkrooms · **Joined:** Thu Mar 29, 2007 9:44 am **Posts:** 1424

Great. Glad you fixed it.

faraj321 · **Joined:** Tue Sep 29, 2009 2:44 pm **Posts:** 9

How can you tell from 1-5 coils and number 6? I matched all the part #'s and realized all mine are the same on the coils. I think someone before me changed the coils and did not get the number 6 specific coil. I called the dealer and he gave me 2 part #'s 8-19005-249-0 and 8-19005-250-1 and I have 6 coils with the same part #. Can someone read the part # on their #6 coil so I can verify. Thanks So Much

jpb · **Joined:** Wed Oct 17, 2007 9:29 pm **Posts:** 76

There is a TSB on this. #8-19005-250-1 is for cylinders 1 through 5. The bulletin lists part # 8-19005-250-0 for cylinder #6. #6 coil is shorter than the other 5. TSB # is IB01-04-S004.

faraj321 · **Joined:** Tue Sep 29, 2009 2:44 pm **Posts:** 9

can you show me where to get a copy of this tsb. I cannot find it online. Thanks

jpb · **Joined:** Wed Oct 17, 2007 9:29 pm **Posts:** 76

We have Alldata and Mitchell On Demand at work. If you can't find it with a search you might have to get a subscription to Alldata.
http://alldatadiy.com/

faraj321 · **Joined:** Tue Sep 29, 2009 2:44 pm **Posts:** 9

Guys, I need HELP!

My mechanic checked everything and cannot find a problem. The Check engine light only comes on when it gets really hot. The code is p0300. To keep you updated I will tell you what he did,

checked timing

Fuel Pressure

Leak tested (said that it cannot be an intake manifold gasket)

backpressure (to make sure cat was not clogged)

I replaced the autolight plugs that were in there with denso, still nothing. Can it still be possible that it is the intake manifold gasket that is the only thing coming to my mind. I also sprayed a full can of carb cleaner to see an rpm change but nothing.

Please HELP ME!

Mark

jeff compton · **Posted:** Tue Oct 06, 2009 5:39 pm

It shouldn't be all that hard to find! That dtc means it's missing at least on one cylinder probably two or more and if it only throws the dtc when hot it doesn't mean it's not missing cold! Anyone with a decent scanner should be able to naviagte to the misfire monitor and see what cylinders are misfiring and address it! If it has an EGR valve block the flow off through it and recheck the misfire data. If it stops then the valve is hanging open and richening out the intake charge and the egr needs to be replaced or there are plugged ports and all the egr flow is going to a few cylinders instead of being distributed evenly. He need to verify fuel pressure and flow under actual driving conditions and monitor fuel trims etc!

jeff compton · **Posted:** Tue Oct 06, 2009 5:42 pm

Forgot to mention as well if it's a single coil ignition system or even a coil pack setup when the engine is cold try heating the coil or pack with a heat gun and see if the misfire shows up before the coolant sensor and coolant come up to temperature. If it does then coil is junk. What about the rest of the tune up? wires, cap, rotor etc?

p0300 on 02 Isuzu Rodeo = RESOLVED

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