[snakebite420]

I have a 2001 Mustang Gt i have a misfire in the 3rd cylinder from the firewall on drivers side.. when idleing i can pull connectors off coil and injector and no drop in RPM i can swap in a working coil pack and injector in that cylinder and nothing happens still no fuel or spark, i have taken the injector harness from that cylinder and plugged into a different injector and it works... would a dead piston still cause my fuel and spark not to drop idle when unplugged?? a few weeks before this happened i installed a focus fuel pump and A KB BAP would this cause me any problems??



the car is procharged 44lb injectors ((stock MAF sensor)), fuel pump and BAP, car is also untuned

[Shaun03GT]

Put in 1 step colder plugs. Gap at .035 and get a dyno tune. You'll need a better maf of a MAFia. Those injrcters aren't calibrated to the maf, probably running rich

[NickPohlAandP]

Run a compression check and make sure that cylinder is good. If you have bad compression you probably have a bent valve. Even with stock cams these 4.6's will hit the intake valve on the piston at high rpms... ask me how I know.

[snakebite420]

ok shaun i am running the NGK v-power in my car now and the MAf i have a Pro-m calibrated for my set up i just need a 3'' Maf housing so i can install it, would my stock MAF cause this problem only in 1 cylinder. And nick i hav'nt done a compression test i need to get that outta the way first off but, something i left out after the car warms up it smokes a faint bluish white out the tail pipes and where the manifold connects to the exhaust it smells like fuel, could it be too rich??

[NickPohlAandP]

It could still be too rich, but I would rule out the cylinder with a compression test as soon as you can. Even if it's rich, it should still fire. If it was that rich, then the whole damn engine should be rich, not just one cylinder.

[Shaun03GT]

Is do a leakdown test over a compression

[NickPohlAandP]

Originally Posted by Shaun03GT Is do a leakdown test over a compression

A compression check is WAAAAAAY easier than a leakdown test and will tell you IF something is wrong. If the compression is good, there's no reason to do a leakdown test. If you find something bad on your compression test though, a leakdown test will tell you WHAT AND WHERE that wrong something is.

[Shaun03GT]

Just because its easier doesn't make it okay. Just saying id do a leakdown test on that cylinder.

[snakebite420]

thanks guys ill do a test on that cylinder an see how it checks out

[snakebite420]

UPDATE the car had coolant leaking into spark plug cylinders causing the misfire, the shop cleaned out the water after this the smoking stopped would only smoke when at idle but would stop after i drove it for a while. After the weekend was over the car began to smoke again like before its a blueish/white (More blue than white) smoke and smells like burnt oil, I was in the process of taking the car back to the shop the following day and all my coolant leaked out of the resivoir onto the ground, anyone got suggestions or ideas??

[moneygreenstang]

Originally Posted by snakebite420 UPDATE the car had coolant leaking into spark plug cylinders causing the misfire, the shop cleaned out the water after this the smoking stopped would only smoke when at idle but would stop after i drove it for a while. After the weekend was over the car began to smoke again like before its a blueish/white (More blue than white) smoke and smells like burnt oil, I was in the process of taking the car back to the shop the following day and all my coolant leaked out of the resivoir onto the ground, anyone got suggestions or ideas??

get a compression test, leakdown test, find out whats wrong with your color system but doing a pressure test.. and if everything checks out get a dyno tune

[WickedSnake00]

Originally Posted by moneygreenstang get a compression test, leakdown test, find out whats wrong with your color system but doing a pressure test.. and if everything checks out get a dyno tune

Even before this check what your oil and coolant looks like. This many issues popping up that the same time has got me wondering. Blueish smoke indicates burning oil, and pushing coolant out the reservoir can indicate the system is being pressurized by another source. I won't say what it might be because I don't want to jinx you.

[snakebite420]

The oil is fresh seems a lil runny though, under the oil cap only once have i seen any white on the bottom of cap, but as far as my dip stick no discoloration, my antifreeze isnt discolored, stinks and there is some brown residue on the inside of resivoir but i have read that is normal.. But like before i can pull the injector plug off the second inj from the front of car on driverside, I can pull this connector and no change in idle, I have put a noid light to this harness and i have a pulse And I imagine it will do the same for that coil like before these two components can be unplugged an u'd never know, swapping these parts does not help the problem either..

[snakebite420]

other than the smoking and leaking coolant while parked for a while and the slight skip the car has, it runs great only startup problem i have had since the problems i have is when its really cold in the mornings its hard to start usually have to wait till the sun gets out around lunch but has only done that to me twice.. This is an awesome car but these lil mishaps are driving me crazy is the motor fucked or am i missing something...

i do have upgrades like 44lb inj 75mm TB an plenum and a p1sc charger and a few more goodies but it currently has a stock MAF in the car no tune that im aware of but i do have the correct MAF (Pro-M) fir my car just no housing to fit it... {If any of this helps}

[snakebite420]

im gonna start to tear this motor down and may just give myself an early bday present and grab the MMR 900 shortblock ive been droolin over