1990 ranger 4.0 OHV #3 cylinder miss

[Solitaire]

So had a dead miss on #3 cylinder found bad injector replaced it. New plugs, coil pack wires and fuel filter. Checked compression 250 psi pulled valve covers check valve train all good. Fired it up miss gone. Test drive no power started back firing under heavy throttle. Check for codes code 11 = no faults found. What am I missing here. Did check plug wire connections and firing order it idles fine with no miss.

 

[rusty ol ranger]

So had a dead miss on #3 cylinder found bad injector replaced it. New plugs, coil pack wires and fuel filter. Checked compression 250 psi pulled valve covers check valve train all good. Fired it up miss gone. Test drive no power started back firing under heavy throttle. Check for codes code 11 = no faults found. What am I missing here. Did check plug wire connections and firing order it idles fine with no miss.

Id rerun your compression test 250psi would blow the head off.

After that check your fuel pressure....did it backfire through the intake or exhaust?

 

[Solitaire]

Sorry typo compression was 150. And backfire out exhaust. We also put new gaskets on fuel rail top and bottom. I apologize for my bluntness I was frustrated when I posted earlier.

Thanks in advance.

 

[SenorNoob]

The 90 PCM is pretty primitive, by the time it throws codes something is usually VERY wrong.

My 1st guess would be the new injector isn't very good or at least is different from the other 5. (They are controlled in groups of 3 in 90. So if one of the 3 is different the computer can't adapt.) You may have to get a set. Ideally a flow matched set of injectors. There are services that do injector "rebuilds" and test them. I usually see them listed on Ebay with a picture of the cleaning/flow test machine.

Edit: Like this: https://www.ebay.com/itm/200946144726