I'm running a 87 Octane tune right now, I'll fill up with premium and see what happens. It's not like loud pings, they are subtle and it sounds like valves I really don't know.

Best way to clean fuel injectors? Just put a fuel system cleaner in the tank or take them off and soak them in something?

 

a lot of guys run SeaFoam thru the brake booster's vacuum line. Do a search on it. i believe this will send the seafoam down the fuel rail.

the pinging is most likely from the low octane. higher octane fuel is harder to ignite. thus it doesn't ignite when the injector sprays it into the cylinder. it'll take the spark of the plug to ignite it. whereas, low octane fuel can be set off by the high temp of the cylinder wall. so when the piston is rising in the cylinder, the gas ignites prematurely, forcing the the piston to rattle as it fights its way up the cylinder against the pre-ignited compression. however, today's knock sensor are excellent at retarding the spark to compensate for this problem.

 

No seafoam. Running it down the brake booster line can cause hydrolock and cost you an engine it can also cause damage to catalytic converters. Techron or Gumout are known to work. Dealers do the motovac service that is also known to be effective..

 

Like I said - put Techron in the gas to clean fuel injectors. Putting ANYTHING down the brake booster line will NOT get to the fuel rail.

Just noticed something in your sig - get that TB spacer OFF that engine. It does NOTHING for you except make more noise, and it MAY be causing problems.

 

Yeah, Jethat and glc, I'm not going to do a seafoam treatment.

Just filled up with premium and some techron.

glc, you really think the spacer could be causing problems? If so I'll take it off this weekend...

 

Spacers do absolutely nothing positive for a computer-controlled fuel injected engine.

 

Alright, will take that off tomorrow while I'm changing the front struts. See how it runs after that.

 

Alright so right after I posted that last update I changed my front struts but didn't have time to take the spacer off. Two days later I wrecked my motorcycle and broke my leg in two places . My truck has been running great, only some minor idle stutters when starting up in the morning.

I think I have an exhaust leak because it's sounding funny right where my headers meet my pipes, I'm going to get that checked out tomorrow.

Today I went to physical therapy, truck running great there, afterwards I was pulling into work just doing like 10 MPH then my engine idle went really
low and the engine stopped running. I put it into nuetral and cruised into a parking spot, no power steering, air still working, radio still working,
all dash lights on as if I turned the key into the on position. I turned the key off then turned it back into the on position then started my truck with
no problem, let it run for about 5 minutes and no stutters or engine shut off. I've been running premium 92 octane and filled up with 87 octane yesterday.
Just trying to figure out why my truck shut off and if it'll do it again.

 

Well went to an exhaust place the other day and they told me I have a leak where my headers meet the block and another one where the headers meet the pipes. Would this cause a misfire in my case? The exhaust place seems to not think so but I beg to differ.

 

The exhaust place is probably right. You might have a broken bolt though and thats a project..

 

Jet, I'm not worried about the bolt, I'm gonna have the leak repaired at a shop. My main problem is the misfire.

 

The headers were replaced little over two years, if the exhaust leak is bad enough can it cause something to happen with the O2 sensor to cause a mis-fire? Dropped it off at the mechanic today, might need a new manifold... kind of crappy since those are supposed to last longer and be better than OEM... should have just left the OEMs on there, they weren't giving me any problems.

 

Yea, you should leave your truck to the mechanics, since you don't have the ability to think straight about this.

Headers aren't bad, - your connections are.

Misfire and exhaust is unrelated.

Don't blame it on the hardware, although shorty headers do absolutely nothing for that engine.
____________

Get the ignition misfire fixed, - maybe it won't quit on you again.

Listen to the mechanics, instead of trying to out smart them.

 

Freakin can't do anything with a broken leg jbrew.
I thought I had it fixed when I took it to them check out the mis-fire a few weeks back, it worked pretty well for about a week then started missing again. That's when my buddy told me it sounded like I had an exhaust leak...

Broke my leg less then a week later and waited 3 weeks to get it looked at (last week) dropped it off today. Going to have the exhaust leak fixed and, if that doesn't fix the mis-fire, then take it back to my other mechanic to have them look at it.

Maybe it's the tune I'm running? 93 Octane and that's all I'm running through it now because what's 2.50$ when I'm paying 40$ for 10gal anyway??!!

^^Edit... it mis-fires when I have any tune on, from towing, to no tune.

 

Yea, a broken leg takes forever to heal, seems like, and that sucks.

So again, the exhaust problem isn't causing the misfire unless you have an EGR problem. You don't as far as I can tell. Like jethat posted earlier, you would have a DTC (code) in memory pointing to it.

Strictly ignition, -specially if you have returned to the factory tune and things didn't improve. Which is usually a coil, plug or bad wire, if you have plug wires.

However, It can be worse if you find a compression problem at the misfiring cylinder. Have you determined which cylinder is missing ? Has your CEL blinked then shut off ? Is it illuminated currently ?