Spark knock with the Hypertech Power Programmer

1337vending · Post by **1337vending** » Mon Mar 21, 2005 4:06 pm

Do any of you guys get spark knock when using the 87 octane tune and 87 octane gas with the HPIII? Maybe its just the oxygenated gas out here in California. It was knocking so bad that I had to put in 91 octane because I left the programmer at home... =/

Post by **HenryJ** » Mon Mar 21, 2005 5:38 pm

I haven't had that problem, but I get better mileage on the mid grade , so I run 89 octane most of the time.

You might keep your senses "keyed" for cat troubles.
The rotten egg smell from the RH side, heating up quicker than normal, loud intake noise, knocking/pinging, mileage drop, etc.

The pre-cats have been know to plug on more than just mine.

jeff024 · Post by **jeff024** » Mon Mar 21, 2005 5:46 pm

if the pre cat gos you gotta get the pre cat and the cat replaced CORRECT they are welded ?

1337vending · Post by **1337vending** » Mon Mar 21, 2005 5:47 pm

Thanks for the heads up on the plugged pre-cat...

....I've got about 20k miles on my truck so far, so I'd hope its not plugged already...

Post by **HenryJ** » Mon Mar 21, 2005 5:54 pm

jeff024 wrote:if the pre cat gos you gotta get the pre cat and the cat replaced CORRECT they are welded ?

The are not directly welded together. There is a pipe between them.

Here's what I did to mine when it plugged - Plugged precat

I think mine plugged at about 30K?

cronkm · Post by **cronkm** » Mon Mar 21, 2005 7:50 pm

I have run both 87 and 91 here in so. ca. I actually get a little better gas mileage with 91 when I don't keep my foot into it. Have not heard any knocking with either.

bwenny247 · Post by **bwenny247** » Mon Mar 21, 2005 8:01 pm

sorry to get off topic, HJ have you had any O2 sensors go bad or service engine soon lights come on since you've had your pre-cat eliminated?

again, sorry to get off topic.

Post by **HenryJ** » Mon Mar 21, 2005 8:07 pm

bwenny247 wrote:sorry to get off topic, HJ have you had any O2 sensors go bad or service engine soon lights come on since you've had your pre-cat eliminated?

Nope, no problems or lights. The main cat should be more than enough, IMO.

killian96ss · Post by **killian96ss** » Tue Mar 22, 2005 7:45 am

1337vending wrote:Do any of you guys get spark knock when using the 87 octane tune and 87 octane gas with the HPIII? Maybe its just the oxygenated gas out here in California. It was knocking so bad that I had to put in 91 octane because I left the programmer at home... =/

I live in CA also, and I'm using the 93 octane tuning even though all we have here is 91 octane. I have had no problems with my tuning, and I actually get better gas mileage with the 91 octane. Occasionally I will fill up with 1/2 tank of 96 octane (Sears Point Sunoco), and 1/2 tank 91 octane, and I can tell you it really wakes up the motor and makes it run much smoother.

It sounds like there is something else wrong with your truck. Is it possible that you got some old or cheap gas? I have had spark knock on other vehicles when I tried to use cheap gas. Too much spark advance can also cause this problem.

Steve

S-10CREWCAB.NET

Spark knock with the Hypertech Power Programmer

Spark knock with the Hypertech Power Programmer

Re: Spark knock with the Hypertech Power Programmer