2.3L ('83-'97) Misfire help

[91red]

I have a 91 custom with the 2.3 and it’s missing pretty bad barely smooths out with rpm and replaced coils plugs and wires and injectors and fuel pressure regulator and it just won’t fix

 

[alwaysFlOoReD]

Just read on another thread where they fixed a misfire caused by a bad injector connection.

 

[91red]

Just read on another thread where they fixed a misfire caused by a bad injector connection.

I pulled the whole injector harness and and nothing is is sparking off each other was it the connector that went bad ?

 

[alwaysFlOoReD]

Yes, the catch had broken off and the connector was loose.

 

[RobWigglezz]

Unfortunately, you could still be working with a faulty new part.

With it stumbling, spray something flammable in the throttle somehow to see if it smooths out. If it does there's something else going on with fuel delivery.

You could have a bad coolant sensor also. I think the temp gage and ECU (probably 2 wires) both have their own so your gage would still work.

If that does nothing, throw a timing light on and see if it's holding steady on the damper.

 

[91red]

Unfortunately, you could still be working with a faulty new part.

With it stumbling, spray something flammable in the throttle somehow to see if it smooths out. If it does there's something else going on with fuel delivery.

You could have a bad coolant sensor also. I think the temp gage and ECU (probably 2 wires) both have their own so your gage would still work.

If that does nothing, throw a timing light on and see if it's holding steady on the damper.

How would I check with a timing light ?

 

[91red]

I also forgot to say I put a new timing belt and retimed the motor

 

[RobWigglezz]

How would I check with a timing light ?

Clip the pick-up on the #1 plug wire, depending on what light you have set it at 0 to 20 degrees BTDC and aim it at the crank pulley. Adjust the light until the timing marks are visible and just see if it holds steady.

A miss at idle that goes away with RPM can also be a cylinder with low compression. I would check compression before messing with a timing light

 

[91red]

Clip the pick-up on the #1 plug wire, depending on what light you have set it at 0 to 20 degrees BTDC and aim it at the crank pulley. Adjust the light until the timing marks are visible and just see if it holds steady.

A miss at idle that goes away with RPM can also be a cylinder with low compression. I would check compression before messing with a timing light

I already did a compression test and all cylinders are great I worked on it until midnight last night trying to narrow it down and 1 and 2 aren’t igniting so I have 2 new coil packs coming to see if it’s that first if it’s not that I’ll be putting in a icm in it as well