H2 Engine Misfire
 

I have a 03' H2 with a Magna Super Charger (here's the web site for those who may be interestedhttp://www.magnacharger.com/sc-hummerh2.htm) which has been working great for over 3 years. However just recently I started noticing a slight engine misfire when the engine is idling, and then today when I started the engine the missed fire was very evident. The engine RMP goes from around 1000 down to 350 and back up. I have a Hyper Tech on board (http://www.hyperpac.com/) and when I check for codes it read P0300 which says "Radom/Multiple Cylinder Misfire Detected". Can anyone direct me to the most likely area to check out? Has anyone ever experienced this problem?

RE: H2 Engine Misfire
 

thats the same code that h3's get when they have to get a head replacement. not sure on your h2 but I would have it checked out quick.

RE: H2 Engine Misfire
 

Thanks for the tip, I hope thats not the case. I'm having a Tech look at this week. I'll let you know what we fnd out.

RE: H2 Engine Misfire
 

Maybe plugs or plug wires..

RE: H2 Engine Misfire
 

HOPEFULLY!!!![:@]

RE: H2 Engine Misfire
 

could be many different things that cause a misfire but that code just makes me cringe:D:D

Didn't mean to make you nervous with my original answer to you.

RE: H2 Engine Misfire
 

Spoke to a tech friend (top notch Hummer Mechanic)who suggested to start out with the most likely stuff, like changing out the fuel filter,plugs,wires and clean out the Airfilter. I have one of those Ram Inductionair filters which you clean and re-install.. The fuel filter makes alot of sense. Since I have a supercharger with duel fuel pumps the filter is working twice as much. By the way in addition to the supercharger I have also installed theStage IIB kitfrom Breathless Performance which has really made the supercharger sweet. Here's the link to Breathless Performance http://www.breathlessperformance.com...0Stage%202.asp.

After doing all that typical tune up stuff, he saidif I'm still having trouble have the injectors cleaned out.I will keep you all posted. Thanks forall theadvise.

RE: H2 Engine Misfire
 

Before you start fooling around with the injectors..run a couple of cans of this stuff through (1 can per tank full)...This stuff is phenomenal (pricey too, about $20.00 per can), But it works miracles..Google it to find a distributor near you.
BG 44K

http://i16.photobucket.com/albums/b47/Atwater/BG44K.jpg

RE: H2 Engine Misfire
 

Thanks. I heard about this awhile ago froma dealership thathad once worked on my daughter's car which had an EGR problem. It seem to have help. I will give it a shot. How often do you think I could use it?

RE: H2 Engine Misfire
 

To start with one canper the next two tank fulls..let the tank go almost empty before refilling.

I use it in my Jag and Hummer, one can at every oil change (5000 miles) and RedlineSI-1, one bottle every 1000 miles