Random/Multiple Cylinder Misfire Detected

[datapimp69]

well my H2 has just started throwing this code.

when i am at WOT, it does surge or hesatate, the tach does go up and down.

i do have a super charger on it and a borla exhaust.

anyone else have this problem.

oh... i have been trying diffrent brands of gas since this started to see if i was getting some bad gas.

[HUMTECH]

Likely have A restricted cat converter. Check backpressure of both if either is over 1 psi of backpressure that will cause random missfires on that bank.

[H2 Bill]

HUMTECH is right (as usual!). I had the same thing happen last week. I got the same code and have been getting a code for a bad passenger side converter too. It happened when going up a steep incline and punching it hard and the check engine light kept blinking on and off. I downloaded (if I remember correctly) code P101. I have a supercharger also.

[datapimp69]

i forgot to mention that i had high flow cats installed. there is allmost nothing in there and cant see how it would make any back pressure but i will check it

[H2 Bill]

Where in the world did you find hi-flow cats for the H2?

[datapimp69]

Originally Posted by H2 Bill

Where in the world did you find hi-flow cats for the H2?

just find the right size and put them on.

here is what i bought

http://store.summitracing.com/partdetail.asp?autofilter=1&part=DTC%2D79%2D400250 &N=700+0&autoview=sku

[IRA51]

what code # is it throwing ? on a side note you could have gotten the Random tecnoligy cat to fit in the H2 without any problem ,and I hear they claim to be the freest flowing.

[HUMTECH]

Ummm well the stock converters when working properly have less than 1psi backpressure, hard to get much flow increase over that.

[H2 Bill]

Originally Posted by IRA51

what code # is it throwing ? on a side note you could have gotten the Random tecnoligy cat to fit in the H2 without any problem ,and I hear they claim to be the freest flowing.

At first I got the po420, I replaced the driver side cat and then got the po430 and replaced the passenger side. No codes since.

[IRA51]

have you checked to see if the headers havent burned the plug wires? old cheap skates way to check plug wires . get a spray bottle and spay the plug wires a night and start the truck if you see sparks the wires are shot . a DVOM will also work no water needed.