misfire at idle, but not under load

I drove it around the block and it misses under load. I'm not particularly familiar with HP tuners software but all stand-alone ECU have the option of altering dwell time. The truck is an '01 Silverado 4.8 with some mods done to it. #2 injector is definitely not as audible. He also said it sometimes comes back if you really tip into the throttle, but under normal driving conditions it seems to run normally. Not on one cylinder but while scanning for about a minute, I had at least a couple misfires on every cylinder except #2.

Posts. Forum » General Tuning Discussion » Random Misfire at Idle, Fine Under Load.

If I … I HAVE broken ringlands and those broken pieces DID smash my plugs. My first thought (as well as his) was the coil packs. 158 As always, contact Ed Morad for your used parts needs. Turned out to be a bad injector. A P01 ECU : Engine> Spark> Dwell for that suggestion. The weird thing is that I don't see misfires while under load. As the title says, I have a P0300 for random misfire but only at idle.

I am both the builder and the tuner and I can post the tune file if anyone wants to take a look through it. This is fact. For a better experience, please enable JavaScript in your browser before proceeding. Idles great now! Car is in TX so I'm not able to go look at it unless I'm flying down to buy it. Joe, most likely it's caused by your changed idle due to your cam. The OP's car is a 97 that uses coil packs (two coil packs with four posts that fire two cylinders at the same time), not COP. As far as I know, there is not a way to adjust dwell time in the PCM. Yesterday, I started it up, casually took it around the block for about 10 minutes. Page 1 of 2 1 2 Next > Aug 17, 2014 #1. I would use a colder heat range. He's said it has a misfire at idle, but it disappears at about 1300 rpm.

The misfire tables needed scaling for the cam. The light went away, and it stopped misfiring. I'm seeing random misfires at idle. Even for an experienced diagnostic technician, ­attempting to diagnose an intermittent misfire ­condition that occurs only under specific driving conditions can be a frustrating exercise. On some engines the lean mixture can cause misfire at light loads. If the dwell time is off, how would that be corrected? Suggestions appreciated. I decided to try the codes anyway, sure enough one was pending... P0302 ....cylinder 2 misfire. When my VQ35DE isn't under load, it misfires.

Please enter your details below to sign into your account, Please enter your details below to register for an account, This email is already in use. Discussion in 'SN95 Cobras' started by Mentos, Aug 17, 2014. Unplugging one coil pack at a time will prevent four cylinders from firing. Not on one cylinder but while scanning for about a minute, I had at least a couple misfires on every cylinder except #2. News, products, problems and results. I've attached a lengthy log so anyone with any input can see exactly when the misfire counts start going up.

Misfire at idle and under load....no codes Discussion in 'SN95 Cobras' started by Mentos, Aug 17, 2014. https://www.briskusa.com/spark_plug_cross_reference_heat_range_chart, Looks like you are idling at 650 on this cam when miss fires are highest. A forum community dedicated to all General Motors makes and models owners and enthusiasts running the 3800 series engine. JavaScript is disabled. Originally, I diagnosed and repaired a P1136 code by replacing the bank 2 camshaf sensor. VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Car does not feel to be misfiring while under load, in fact the car runs like a champ while accelerating or decelerating (assuming I don't clutch in) When driving, if I clutch in to slow down the car will occasionally shut off.

Attachment 95590

The S1X cam I would think is a large enough cam to cause this, but I could be mistaken.

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