Dropped Cylinder in 99 3.2 Rodeo

[meporsche]

Hello, Recently developed a dead miss in one cylinder, came and went for a while, then became permanent. I put in new plugs, spark is hot, jumps 1-1/2 ". No luck so I started pulling injector connections and isolated the dead cylinder. Have 150# of compression in that cylinder. Figured it was the injector so I replaced that with new. No luck, same dead miss.

Checking the voltage at the injector connection I have 13.9v on one side at all injector plugs. On dead cylinder I have a varying .3 v but on the others I show voltage of .02v -.07v What should voltage readings be?

Is this the cause of the miss? Is the injector not spraying? if so, how do I troubleshoot this?
ANy help is appreciated.

thanks, Darwin

[StevenZ]

Coil?

[meporsche]

I'm thinking if it was the coil: it would not just be one single cylinder missing/dead. And I have huge spark. I'm thinking that I need to take old injector and clean it, test it to make sure it's working and hook it up to the harness, fillit with solvent and see if it sprays. It is doesn't, I have isolated the wiring. If it does I'm really lost

[StevenZ]

Not sure, but I think each spark plug has its own coil and perhaps the coil associated with the dead cylinder is the issue. May try swapping coils with another cylinder and see if the problem follows. Just my 2-cents.

[meporsche]

I have good quality spark at the plug/boot. I put a stethescope on the injector and it is functioning. Prying the injector a bit squirts fuel from the rail/injector connection.

SO I have compression, spark and fuel ( at least to the injector ) but the cylinder isn't firing. I'm lost as to what it could be. The only thing I can think of is that the fuel path to the cylinder is blocked somehow.

[DeltaP]

Try swapping injector with another cylinder and see if the miss follows it. Also the coil like mentioned. Just dont do them at the same time.

[WhiteRodeo4x4]

Originally Posted by DeltaP

Try swapping injector with another cylinder and see if the miss follows it. Also the coil like mentioned. Just dont do them at the same time.

My 2001 V6 3.2 had a problem similar to this and I found out that one of the coils is a different length than the rest. If you did a plug change and did not pay attention to which coil went with which cylinder that is your problem. Look at the valve cover and you'll see that one of the holes sits higher than the others and if you put that coil into another cylinder it will lose spark because of the gap.

[meporsche]

Problem solved. There was a cracked wire far back in the Injector wiring loom, voltage was there but wasn't pulsing the injector