I was having issues with my fuel pump a few days ago so I pulled the tank and found it full of rust. I replaced the tank and fuel pump added a can of seafoam to a full tank of gas and it ran good for about 3/4 of that tank. Then it started having trouble accelerating again. I thought maybe the injectors had gotten clogged with the rusty fuel so I took out all the injectors and cleaned and tested each one and reinstalled them. Now the first three cylinders won't fire. I have metered the injectors, I can hear the each injector actuating. I checked the spark plugs (swapped with other working cylindrers) I can't figure out what is causing this. Please help! Thanks

 

I do have a spark at each plug. I even got zapped a couple of times. What else could I check?

 

All your vacuum lines are good?stupid question but it happens .

 

There was a kink in the vac line! I staightend it but still no change in the 3 cylinders. Its starting to sound a little rough and white smoke from the exhaust. Maybe from the injector cleaner?

 

Could that kinked vac line have caused permant damage to the cylinders?

 

I have to floor the petal to get it to start. Do I need to bleed the fuel lines after cleaning the injectors and fuel rail?

 

I would remove the rail and all the injectors. get a seal kit for the injectors before you do this. there is a good chance that 1 or more might get damaged. turn each injector upside down and tap it on a towel. the injectors have a small screen at the inlet and could be plugged up with debris. flush the rail as well once all the injectors are out. if you use a little oil on the upper O ring seal you will have less chance of damaging them when you re install.

 

the kinked line would not cause damage. you may want to make sure it did not get a small tare in it.

 

I installed all new o-rings on the injecters. I flushed all the injectors and the rail. I tested each injector and saw that each one was spraying fuel before reinstalling. All the vacuume lines are good now. I even pulled each hose and blew through them to make sure they weren't clogged.

 

Here is a video of how I cleaned the injectors using a battery and carb cleaner.
www.youtube.com/watch?v=7aT4S1lIBAY

 

Did you screw up the TB to MAP hose in the process? If so, it will run pig-rich because the MAP sees low vacuum and tells the ECU to open the injectors for a long pulse.

 

Just did a compression test,
Cylinder 1 140
2 135
3 145
4 135
5 132
6 132

 

How exactly did you determine that the first three cylinders aren't working?

You sure the injector wires are in the correct order?

 

White smoke is most likely from the Seafoam.

 

Determined cylinders werent firing by unplugging spark plug wires one at a time and no change in engine sound for the first three.

I labeled the injectors and I'm sure they are in the correct order.

Just replaced the map sensor and hose just to be sure, still no change. Do I need to disconnect the battery for thirty minutes to reset computer, because just tested cylinders again and still not working.

I took off the cylinder cover a minute ago to see if any obvious damage, but everything looked okay.

Any other suggestions? Maybe the throttle position sensor or the crank position sensor?