Can somebody help with a 92 geo storm???

[turborich]

It's a 92 geo storm 1.6 liter SOHC.

The car starts right up but has a miss to it. At idle you can feel it a little bit, when you rev it you can feel it & hear it. Once the RPM's get higher the miss goes away.

Example: When taking off from a dead stop it misses & then goes away. If you are already cruising & floor it, it runs just fine & the power is good.

I have changed the following

spark plugs (correct gap)
ignition wires
dist. cap
dist. rotor
air filter
oil & filter

The timming is correct as well, I checked it. There is NO check engine light & it passed emissions, but barley. It was running rich.

I checked the spark plugs today & the #2 plug was black (rich) I verified that it was getting spark by pulling the boot & letting it arch, I then got an extra plug & grounded it to the block, it has plenty of spark! So, Why only one cylinder???

I am guessing that it may be a bad fuel injector. What do you guys think? If it were spraying too much fuel it would stumble at idle but go away as the rpms got higher, right?

I also pulled the valve cover to see if there were any broken springs or worn cam lobes but everything looked good, I even did a compresson test & all cylinders were at 150 PSI.

I have checked for vacuum leaks & there are none.

HELP!!! Thanks, rich

 

[Roadboss]

Try swapping around injectors to see if it is bad. I think that's what it is.

 

[Bildabo]

Try swapping around injectors to see if it is bad. I think that's what it is.

+1

its an easy check

 

[ford nut]

Misses hide at rpm.
let it idle when missing and pull each plug wire off one at a time,
Just do one at a time, put on some thick welding gloves use inslated Pliers.
See if miss gets worse or no change.
If you have one hole with no change thats the hole were your problem is.
When I had a injector go bad on a 5.0 thats what I did.
The next step I did was pull the coil wire wire so I had no spark and crank the engine the hole that made no change also had a dry spark plug so bingo bad injector.
Hope this helps when mine went bad it just stoped spraying.

 

[turborich]

Thanks for the help guys,

I am thinking that the injector is spraying too much fuel because the one cylinder/sparkplug is black. I know what cylinder it is, I just kinda wanted to be certian that it was the injector before I started to pull it apart. Is it common for an injector to dump/spray too much fuel?

As for the spark, all cylinders have strong spark.


Thanks!