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

 

[scotts90ranger]

what do you mean one and two aren't sparking? That's not how it works... it's a waste spark system, one side of the coil (with respect to the connector) goes to cylinders one and 4 and the other side to 2 and 3, both coil packs fire at the same time and the same cylinders should be connected to the same sides of the coil packs, the front and rear orientation doesn't matter. There's literally just separate ignition systems that fire at the same time, one on each side of the engine, from '89-94 during cranking only the passenger side fired but once running both fired.

If you have plug wires on the wrong spot on the coil packs that can definitely cause a misfire problem.

If there's an issue with the crank sensor usually they cause a stall when hot but there's more than one way to have an issue. I don't hear of too many issues with the DIS module, I've never had one...

 

[91red]

what do you mean one and two aren't sparking? That's not how it works... it's a waste spark system, one side of the coil (with respect to the connector) goes to cylinders one and 4 and the other side to 2 and 3, both coil packs fire at the same time and the same cylinders should be connected to the same sides of the coil packs, the front and rear orientation doesn't matter. There's literally just separate ignition systems that fire at the same time, one on each side of the engine, from '89-94 during cranking only the passenger side fired but once running both fired.

If you have plug wires on the wrong spot on the coil packs that can definitely cause a misfire problem.

If there's an issue with the crank sensor usually they cause a stall when hot but there's more than one way to have an issue. I don't hear of too many issues with the DIS module, I've never had one...

Yeah I can unplug the wires for cylinders one and two along with the injector plugs and nothing changes and those spark plug in one and two are soaked

 

[scotts90ranger]

Here's a picture I stole from online which is what the stock coils would look like including the sticker labeling the cylinders, notice 1 and 4 are on one side and 2 and 3 are on the other, make sure both coils are set up like that, you can mix up 1 and 4 or 2 and 3 but NOT the other way.

Unless you have two injectors stuck open the firing order is your problem, heck even the injectors are batch fire combining 1 with 4 and 2 with 3, there shouldn't be anything in common between one and two unless something is wrong...