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  #16  
Old 05-27-2011, 06:20 AM
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Default Re: hesitation and missing on acceleration

I have a 4cyl. 1997 model. How do I find out what they are supposed to ohm at to be in tolerence?
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  #17  
Old 05-28-2011, 05:08 AM
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Default Re: hesitation and missing on acceleration

just looked through my Haynes manual and it didn't tell. Call your local Auto Zone, they like giving out free info. Also ask if they carry a CHILTON manual for your model ranger. Chilton is a little better detailed than Haynes. But i guess that the guy that told you 11 to 17 ohms knows what he's talking about! Do you know how to check ohms?
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  #18  
Old 05-29-2011, 12:30 PM
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Default Re: hesitation and missing on acceleration

Yes Sir, i can do that. Getting to the contact points will be the trick
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  #19  
Old 05-31-2011, 10:07 AM
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Default Re: hesitation and missing on acceleration

The info i received cam out of a general service manual from my mechanic. He has been doing pretty good things that i have no tools for on my truck. learning alot for my other vehicles too.
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  #20  
Old 06-04-2011, 03:32 PM
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Default Re: hesitation and missing on acceleration

set ohm meter to 2000, placed leads on terminals on the injectors...reads a 15. All four read the same and the mechanic had replaced one with a new one. So I am assuming all is good.

I am still stumped.
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  #21  
Old 06-04-2011, 10:17 PM
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Default Re: hesitation and missing on acceleration

I had the same problem with my 97 Ranger 2wd. It only would start missing when the engine came to temp. I replaced plugs and wires, but she still ran rough. So next step replaced both coil packs and so far she's running good!
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  #22  
Old 06-05-2011, 07:09 PM
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Default Re: hesitation and missing on acceleration

New update.....I pulled the intake off again. I ohmed all for injectors. I mention earlier the mechanic changed one to see if it would help. It ohms at 15. I ohmed the other 3 and all read 15. Put it back together and read some more threads. IAC valve. I had taken it off before and sprayed it down, but that was all I knew. I did some reading and checking and found out that if you turn key it is supposed to plunge or atleast move. I was not getting anything. Ohm it and I read 10. So I decide to go buy another being 10 or above is supposed to be bad. Get the new one and ohm before install. I read 9 to 10. So hmmmm. I have it, install it. I take a small screw driver and move plunger. It moved so freely. I did the same to old and It hardly moved. Could this be my problem????? Install new and reinstall intake. Crank the truck. Idles smooth and can hardly hear it. It idled before no problem but dont think as smooth. Test drive. Seems to drive better throttle wise. Still getting a slight hesitation, though not as bad as before.
What do I check next? Going tomorrow to check with mechanic. I will show him the IAC.
I still dont know why?????
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  #23  
Old 06-06-2011, 04:29 PM
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Default Re: hesitation and missing on acceleration

Crank shaft sensor is the problem with my 97 2.3L. Code was P0320 Bad harness or bad ssensor. Bought the sensor and will replace this evening, when it cools down! It will cause it to miss when the sensor goes out, or the harness connections are bad! We shall see!!!
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  #24  
Old 06-06-2011, 09:11 PM
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Default Re: hesitation and missing on acceleration

No codes when my 2.3 was missing/bucking/hesitating under acceleration, except the one time it stumbled on startup and threw P0316 and P0302 (miss on #2 cyl within first 1000 revs). Read and reset it with ultragauge.

Things I tried:
air filter
fuel filter
fuel injector cleaner additive (hey, worth a shot)
unplugging MAF to watch for change
plugs/wires

In my case it was the coil pack. Dropped the new one in (four skinny T25 torx-head bolts) and not a single miss since then. It was a few times a minute before.

Sidenote: the duralast coil pack from autozone swapped the driver/passenger arrangement of the banks on the pack. So plug in your wires by number written on the pack rather than using the position on the OEM coil. As always, it's useful to label them before pulling.
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  #25  
Old 06-06-2011, 10:02 PM
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Default Re: hesitation and missing on acceleration

@ fratumus I changed both coil packs ran good fo a bit then the same thing. Just took out my crank sensor and it was broke all the way around!!! It wasn't the removal cause I was easy on it!!! Air filter is not gonna make it miss unless you never change the thing and it can't breath!!!!

Last edited by joeaguilar; 06-07-2011 at 09:44 AM.
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  #26  
Old 06-11-2011, 10:25 AM
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Default Re: hesitation and missing on acceleration

before making the drastic move of getting new injectors, I replaced the iac valve. To me it seemed suggish to function and appeared to rub the shaft. So I replaced this for 35.00....I can dell a difference in first start up, but not enough to have been the problem.

Talked to my mechanic friend. He had me to leave the truck with him over lunch he would runa few errands. By the endo of the day he had since put the gas pressure meter back on while driving. The pressure was low. SoOOOOO>>>>>>>>fuel pump. He ordered me another one and I got it. Took the bed off my truck and installed it. drove the truck some before replacing the bed. Seemed fine so I put the bed back on. Went to fill up the tank and the sending unit was not reading right. Took the bed back off to recheck it. I think I did not have the pump tabs lined up with the tank indentions or something. Reinstalled. Working!!!!! so I put bed back on. Truck drives with no hesitation. All that for a fuel pump.....Thanks for all your input guys
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  #27  
Old 12-04-2011, 06:37 AM
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Default Re: hesitation and missing on acceleration

problem solved. Not the injectors at all. I replaced the fuel pump. The fuel pump I say, Even though truck would run and start, it was starving for gas as I accelerated. The fuel pump was the culprit. I got a new one and now I am good to go.
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  #28  
Old 01-03-2012, 10:21 AM
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Default Re: hesitation and missing on acceleration

Just to piggy back this thread. I have hesitation on a 1996 4.0 222K miles. I have changed the plugs, wires, pcv, fuel filter, air filter and mas. Still has hesitation. Took it to the mechanic twice. First it was a temp sensor that was causing the hesitation $105. Took it back again this time it was supposedly low compression on a cylinder. Everything I've read on motor hesitation on a ranger is what I have changed. I'm asking would a supposed low compression on a cylinder cause this hesitation? Too add once I get past 2500rpm it runs like a champ!
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  #29  
Old 01-08-2012, 08:54 AM
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Default Re: hesitation and missing on acceleration

Quote:
Originally Posted by x D3 x View Post

Ended up taking it to shop and wound up being the ignition coil.
Were they able to determine that by a fault code, or ?

I've run the codes on mine and there are no fault codes.
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  #30  
Old 01-08-2012, 05:02 PM
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Default Re: hesitation and missing on acceleration

Quote:
Originally Posted by rickatom View Post
problem solved. Not the injectors at all. I replaced the fuel pump. The fuel pump I say, Even though truck would run and start, it was starving for gas as I accelerated. The fuel pump was the culprit. I got a new one and now I am good to go.
Can you tell if the "replacement part" included a "FUEL Pressure Regulator Valve"..??

Sometimes they are called a "Fuel Pump Module"...pump and regulator/check valves all-in-one.
Had that go bad on an old '95 F150.

Maybe in your case the fuel pump was good but the "fuel pressure regulator" device was "Bad" causing the engine to "starve" for fuel at high RPM's.
So,because it might be an "all-in-one module",they replace it as one piece and just call it a "Fuel Pump"....

Thanks just curious to know....
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