i have a 89 ranger 4x4, when i got it they said they put the engine in and would not nun right
but the engine ran like a top in the old truck. after playing with it i found every time it hits a cylinder it makes all six injectors spray, witch would explane the fire ***** coming from the tail pipe. anyone know what would make this happen ??? oh its a 2.9 thanks....

 

An 89 2.9 is "bank to bank", not sequential, so should alternately fire each bank of three injectors together.

If all six are truly firing together, the system may be in HLOS (limp mode). This is the Hardware Limited Operating Strategy designed to keep the engine running enough to get you to your home or to a shop. It does not run well at all in HLOS because it is missing some key input that the PCM needs.

You could try pulling PCM codes to get a direction to go. If there are no codes, try a PCM reset by disconnecting the negative battery cable for a minute.


OBD DTC's and Code Pulling Techniques (94 and earlier)

 

i have unhooked the pos side of the battery a few times, and still the same thing. what could posobly make it go in Hardware Limited Operating Strategy ???

 

It could possibly go into HLOS if the PCM is not getting an important input that it needs. Try pulling the trouble codes. Either use a commercial code reader or you can use the info in the link I posted to pull them without a reader.

 

havent had time to mess with my truck today, working to much. but was wondering if the guy that put the motor in the truck before i got it put in a older ecm, could it couse this problem ??? the truck is a late 89
and i think the motor is 86 or 87 ??

 

More like something isnt plugged in your the wiring harness has become damaged.

The computer will tell you what is wrong. Follow Bobs advice with the scanner or the link he posted.

If you paid a guy to swap your engine I would be making him understand its his problem.

 

i got the truck as is from a friends dad, he payed a guy to swap them out. i saw where some mice had made a nest in the glove box. i hope they didnt get into anything, im starting to think eather someone cut and spliced some wires wrong or pinched some wires somewhere or something. Something really dumb just finding it...

 

Knowing the trouble codes should point you to the problem area.

 

ok got the codes, nothing big and nothing that would make these problems.i did keep getting diferent codes, i would clear it and retry i kept getting 67 and 11 one was a/c wire short, one was timing circit failer and ect ground or low volt. a few times it would lack a # to complete all the codes.Another good one
both wires to each injectors are hot wires. aint one a ground and one positive ???? both injector wires lite up my test light. im still wondering if it has the right ecm in it...

 

You wont be able to see the injector pulse width with the naked eye. The computer will ground the injector for milliseconds. A volt meter or test light done operate at the speed needed to see that. You need an oscilloscope to see that.


Chase the codes, check your harness grounds. Verify your computer code matches the engine.

 

well when i took the fuel rail out of the intake and turn the distributer all 6 injectors spray fuel, at the same time that you can see very well.

 

on the ecm on one side on a sticker is E9TF-G1A and on the other side of the ecm is E9AF 14A624 AA on a purple ink stamp, so witch one is it ?? fun fun ........ from what i found the first one is for a 89 ranger, but the other # is 93 probe, 94-95 taurus or 95 mazda 626... so i have no clue...about to go 302 with a granny 4 speed, LOL !!!!

 

Im lost as to why you have two calibration numbers.

Maybe you do have the wrong computer.

I like option B, IMHO. Fuel economy might go out the window, the 4.0 isn't great anyway in that department.

 

Oh, so, you're testing this when the engine isn't running? This changes things.

When the engine is being to be turned by the starter (~200 RPM or less), the PCM has no idea where the crank is in its rotation and must wait to get a signal from the distributor before it can synchronize the fuel delivery to the crank position. During that very short time, it fires all 6 injectors together.

When you turn the distributor manually, you are simulating this pre-sync "Crank Mode" condition and they will all fire together. If all fire together when the engine is actually running, then it is in limp mode.

 

when it is running, it has black smoke out the tail pipe runs rough, blowes consistent fire ***** out the tail pipe after it worms up. and if you start unhooking injectors it smooths out. it runs smoother on three cylenders then it does six. and its a 2.9 not 4.0 this thing has me lost....