backfire and miss

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03-26-2009, 11:34 AM
lo-lyf

backfire and miss

Last Saturday night when I kinda got on the throttle, my truck backfired and started missing for a few seconds. It started running normal again after that, I let into a little bit again and the same problem. I was about 2 blocks from my house and I took it easy on home and parked it for the night. I went out the next morning and set the old Diablosport back to factory and it ran fine from then on. Later that night though the SES light came on. I hooked my reader up to it and it gave me a igniton coil b malfunction. cleared the code and all is well since. Yesterday I had the cats taken off and one was clogged up. When I got back to work I installed the Nelson and truck runs like a scalded arsed ape. I am assuming the clogged cat was causing the backfire and miss?
03-26-2009, 11:35 AM
GasGuzzler

Need the code number. It's unlikely the cats caused a coil code.
03-26-2009, 11:38 AM
lo-lyf

it didnt give me a number, it was read from the diablo tuner. I checked to see if all of the coils are sparking and they are. The truck doesn't currently have any DTC's so I figure all is well. I just want to make sure since I have kinda hammered on her after I got the new tune.
03-26-2009, 11:45 AM
lo-lyf

Also, I was playing with the spark, power enrichment, etc. etc. on that diablo waste of space that morning. I hope I didn't mess anything up since I had no idea what I was doing. I have a bad problem with that, doing things I shouldnt be.
03-26-2009, 12:06 PM
farmtruc

IF the issue doesn't come back, don't worry about it, it was probably the handheld, I've see it before.
03-26-2009, 12:12 PM
lo-lyf

Quote:

Originally Posted by farmtruc

IF the issue doesn't come back, don't worry about it, it was probably the handheld, I've see it before.

cool, I was thinkin it was just my rookieness mixed with a dash of wrong tune. I'm very impressed with the tune you sent me BTW. I also hear it takes a couple hundred miles for everything to really set in. Can't wait to see how much better it can get. as far as plugs, I have 75,000 on the ODO, what plugs would be best? NGK, AC Delco, what? I should use iridium core too right?
03-26-2009, 12:33 PM
Melissa@NelsonPerformance

stock plugs are fine~
03-26-2009, 12:35 PM
lo-lyf

right on, I always figured a spark is a spark. I just wasn't sure. i like to get as many opinions as possible.
03-26-2009, 01:02 PM
GasGuzzler

Stock plugs are fine but what is stock has changed since yours was built. Put the ACD iridiums in it when it's time.
03-26-2009, 01:40 PM
timber74wolf

What do you think of the Bosch Platinum plugs?
03-26-2009, 01:41 PM
AKlowriderZ71

It is possible that you had a mis-fire occurring, and the unburned fuel entering the cat is why the cat clogged. If your pcm misfire diagnostics are disabled, or "adjusted", you may still have a minor misfire under certain circumstances, but no MIL.

Nelson, if you are reading this, are his misfire diagnostics still at factory settings?
03-26-2009, 02:02 PM
lo-lyf

Quote:

Originally Posted by timber74wolf

What do you think of the Bosch Platinum plugs?

They are over priced junk from what I have found. When I was younger and stupid I bought a set and couldn't get my money back because they had been installed. I got better performance out of the cheapest Champions I had in before I installed the bosch platinums.
03-26-2009, 02:07 PM
lo-lyf

Quote:

Originally Posted by AKlowriderZ71

It is possible that you had a mis-fire occurring, and the unburned fuel entering the cat is why the cat clogged. If your pcm misfire diagnostics are disabled, or "adjusted", you may still have a minor misfire under certain circumstances, but no MIL.

Nelson, if you are reading this, are his misfire diagnostics still at factory settings?

all of my problems happened before the new tune. It is running much better now than before. However, it doesn't spin between 10 and 30 like it did when I bought the truck. It's probably because of the new tires I put on because the truck is QUICK!!
03-26-2009, 02:19 PM
AKlowriderZ71

Your Diablo tune may have also changed the pcm mis-fire diagnostics. It is a very common "tune" adjustment.
03-26-2009, 02:25 PM
tanz45

Stick with Iridiums, pricy, but meant for that motor, different plugs aren't gonna give you any power.
03-26-2009, 02:43 PM
lo-lyf

Quote:

Originally Posted by AKlowriderZ71

Your Diablo tune may have also changed the pcm mis-fire diagnostics. It is a very common "tune" adjustment.

that's what I figured, anyways it wont be a problem anymore, got me a good tune:naughty:
03-26-2009, 03:04 PM
AKlowriderZ71

If you still have a mis-fire problem, you're giving up performance. Probably economy too. Just because it was swept under the rug, doesn't mean it's not there. At least you don't have to worry about clogging another cat. :)
03-26-2009, 03:08 PM
lo-lyf

true, I think I am alright tho. The truck is quicker than before and I am coming up on 200 miles at about 3/8 of a tank. I am going to put in new plugs probably next week sometime just to do some routine maintenance. got my 180 stat in today too so I guess I will do everything at once.
03-27-2009, 01:01 AM
GasGuzzler

Quote:

Originally Posted by timber74wolf

What do you think of the Bosch Platinum plugs?

:puke: :barf: :puke: :barf:
03-27-2009, 08:24 AM
lo-lyf

Quote:

Originally Posted by GasGuzzler

:puke: :barf: :puke: :barf:

and the survey says.........