How often do you change your plugs/hesitation issue. - SRT Forums

love2race · 06-25-2008, 07:33 AM

Haven't been running the car much so far this year, but when I do I'm getting hesitation when coasting in gear anywhere between 110kph and 5kph. However, there doesn't seem to be any hesitation when accelerating.

This wasn't happening before I put the car away, so I don't think it is a tuning issue. I am guessing plugs, but I've got iridium plugs and they are only about two years old, so I'm not sure it that's the problem. Thoughts?

Rugger · 06-26-2008, 02:27 PM

2 year old plugs does not give anyone much info; they may be 2 year old, but if you only drove the car a 1,000km, as say 9 months old with 88,000km on them...see my point?
What gap do you have them set at? what mods do you have on the car? what boost are you running?....there are so many variables...
Are you getting any hesitation when you put load on the motor? How old is the gas in your tank?Try and offer more specific info on this so we can zero on the cause.

p1llar · 06-26-2008, 07:37 PM

are you getting little backfires when shifting? idling a little more rough than normal?

love2race · 06-27-2008, 02:17 PM

Fair enough Rugger.... I'll try and be more specific.

Hesitation occurs when not under load, but also not when in neutral. This could be coasting along at 110kph on the highway or 5 kph coasting to a light. Always run 91 or higher octane from either Shell or Sunoco, nothing else. There has probably been between 7500 and 10 000 miles since the plugs were installed. They are NGK iridium plugs gapped to .035.

Mods are all listed in the signature, I'm running at 19psi and I didn't have trouble with it at all after Aaron tuned it, I had some tweaking done on a dyno in the fall, but it only made it run smoother. The car sat for about 6 months in a garage on stands, battery was crap, so I didn't take care of it during the winter and it was dead in the spring and I replaced it. It is due for an oil change, but it is always replaced with synthetic oil.

Not getting any backfires that I notice between shifts. Idling less smooth then it was prior to being put away. I notice the A/F fluctuating quite a bit while idling.

White_Zzzzz · 06-27-2008, 04:05 PM

usually change them once a year. NGK Iridiums one step colder than stock. I stocked up on them a while back when there was a big GP at a great price.

Rugger · 06-27-2008, 11:54 PM

wondering if you tried the obvious...remove the plugs, take a closer look at them, might wanna try cleaning them,I have an extra set of Mopar wires if you like to try replacing them, you're welcome to borrow them...Have you tried the plugs out at .40?
I would try these suggestions first, to isolate the possibility it may be the plugs/wires.