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  #1  
Old 11-24-2014, 01:31 PM
4.0rangermike 4.0rangermike is offline
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Default 98 4.0 starting/stalling problems

1998 4.0 RWD Manual

Okay this problem has been intermittent for the last two weeks. I believe it is electrical.

What happens is sometimes I will turn the key into the starting position and the starter relay will begin to click rapidly. I replaced the relay and it still clicks with the new one. Sometimes it will do this for an hour sometimes twenty minutes. I cleaned the ground for the battery and it is working a little better but still does it occasionally. I checked all the fuses cleaned them and their terminals.

When it stalls out the CEL will begin to flash and engine will start to have strange revs like it is running to lean or to rich then of course it will sputter and buck a little and when I let off the accelerator the rpms drop so low it stalls out.

I believe there is a bad ground somewhere that has to do with the fuel pump and starter or a short in a wire.

Could it also be a poor connection to one of my O2 sensors that will cause it to try to correct the fuel mixture very rapidly like that?

My mechanics do not know what to do because it runs fine for them at their shop and I guess without it acting up and without a CEL they don't know where to start.

I guess my question is where are all the grounds located for everything that is required to start the truck and could it be a bad connection to an O2 sensor?
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  #2  
Old 11-24-2014, 01:34 PM
96_4x4_XLT 96_4x4_XLT is offline
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one I would proly replace your battery

Two
Pull the codes
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96 Ranger XLT 4x4 4.0 V6 5 speed 173,000 *alive*
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  #3  
Old 11-24-2014, 02:44 PM
4.0rangermike 4.0rangermike is offline
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Default Re: 98 4.0 starting/stalling problems

It cranks fine it just doesn't turn over. The battery tests fine too. the problem with the codes is that the CEL goes off once it starts up again or rests for a little bit. Unfortunately I do not have a code reader and it will not code anytime I have access to one. I will try to get the battery replaced since it is still under warranty and will go from there.

Any suggestions if it is not the battery? or is this something I have to get the codes for?
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  #4  
Old 11-24-2014, 06:09 PM
96_4x4_XLT 96_4x4_XLT is offline
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Quote:
Originally Posted by 4.0rangermike View Post
It cranks fine it just doesn't turn over. The battery tests fine too. the problem with the codes is that the CEL goes off once it starts up again or rests for a little bit. Unfortunately I do not have a code reader and it will not code anytime I have access to one. I will try to get the battery replaced since it is still under warranty and will go from there. Any suggestions if it is not the battery? or is this something I have to get the codes for?
go to auto zone and have them pull codes

They are there I promise
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95 Ranger XLT 4x2 2.3 I4 5 speed 206,000 *dead*
96 Ranger XLT 4x4 4.0 V6 5 speed 173,000 *alive*
D35 front, 8.8 rear, 3.73 gears, limited slip rear diff
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  #5  
Old 11-26-2014, 06:08 AM
4.0rangermike 4.0rangermike is offline
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Default Re: 98 4.0 starting/stalling problems

So my battery checked out good. Charged it up anyway. Went to autozone and 0 codes. I bought a code reader so hopefully the next time this starts to happen I will be able to pull a code right away. It is the strangest thing being able to drive it for days then not starting or stalling out for just a few hours then starting up again without codes.

I also noticed one of the posts on my starters solenoid has broken out of the casing itself the wiring is still connected though. It still starts fine but I will be replacing that this weekend.

I also noticed yesterday when the starter relay was clicking the fuel pump itself was clicking along with it.

I am starting to feel its a poor connection inside the fuel pump itself or it might be dirty. Guess I have to wait for it to act up again and try to pull the code. I will keep it posted.
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  #6  
Old 11-26-2014, 11:14 AM
4.0rangermike 4.0rangermike is offline
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Default Re: 98 4.0 starting/stalling problems

So it was working today fine again then stalled out on my way to class. This time I took out my code reader and plugged it in. Code reader said "No Link". Then it started working fine again code reader said "0 Codes". Is it possible to just have a faulty connection to the cpu that is causing all these problems? I really hope it is not the cpu itself. Dropped it off to my mechanic today hopefully they can fix it with a "No Link" reading.
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  #7  
Old 01-06-2015, 02:02 PM
4.0rangermike 4.0rangermike is offline
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Default Re: 98 4.0 starting/stalling problems

So the mechanic had the same problem with the "No Link" on their code reader. The solution was to replace the on board computer. It worked fine for a week and started stalling out again. So I replaced the fuel filter. It looked so bad that I decided to replace the in tank fuel filter which is on the pump itself. It ran fine for a day or two then started having problems again. Not as bad though. I did an oil change and put a fuel system additive in it. Still "No Link" reading when it is stalling out and zero codes when it starts to work again. One thing I noticed is that the code reader says which sensors are incomplete/complete. Every time it starts to have an issue different ones are incomplete/complete. I don't know what to do and I know my mechanics don't either which scares me a little to bother to bring it back to them. I guess I will have them replace the computer again. Any other suggestions?
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  #8  
Old 01-06-2015, 10:03 PM
tundrafox1 tundrafox1 is offline
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Default Re: 98 4.0 starting/stalling problems

I think you're on the right track about it being electrical. What do you mean "replace the computer again?" Which module was replaced? ECM or PCM. Look up the shop manual, there is a page showing the location of all grounds. Unbolt them, clean them, trace the wire and test with a ohm-meter WHILE WIGGLING THE WIRE. This will tell you if it is a break in the wire. Then consider if that module that was replaced was bad, or installed wrong. Sometimes mechanics cut corners, like not removing all power before replacing a module, which will fry the new one.
Hope this helps.
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  #9  
Old 01-07-2015, 10:04 AM
4.0rangermike 4.0rangermike is offline
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Default Re: 98 4.0 starting/stalling problems

Okay I will try that. I think something is wrong with the electrical because after I got it back from my mechanic when he changed the EGR I had engine noise in the radio. Sounded like a loud whistle and my blinker lights were much brighter than before. There has to be a bad ground somewhere or a frayed wire. I honestly do not want to bring it back to him even if he would fix it for free. Also it was the ECM I believe that they swapped out. So I might just make them replace that. He probably put something back together wrong and power spikes are making the ECM go nuts.
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  #10  
Old 01-26-2015, 06:03 AM
4.0rangermike 4.0rangermike is offline
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Default Re: 98 4.0 starting/stalling problems

It was the PCM they replaced. Since the last post my fuel pump died. I guess it fried out due to it being turned on and off so many times when the starter relay was clicking. It was only three years old. So I replaced that and it ran good for a few trips before it had a loss of power at speed on the highway. I checked the code reader and it said EGR/Cat./Evap./O2heater/ incomplete. However it did not stall out completely this time so I feel I am going in the right direction. I replaced the evap. sensor which does not come with the fuel pump set-up. Then things changed. I let it idle for twenty minutes and it had a moment where it revved for a few seconds then went back to normal. Now the incomplete sensors were only the cat. and the evap.. Both new sensors by the way. I decided to take it for a drive and after ten minutes it began to rev erratically. I pulled over and watched as the CEL began to blink on and off in an erratic manner. I tried to pull a code and got "No Link". I checked the Haynes manual and the only other thing that can cause erratic revving besides an electrical problem is the PCV valve and a vacuum line. So I replaced the PCV since it is way over due for such. I also cleaned the cat. O2 sensor. After sitting it seems to reset and runs again. I also checked my battery because the battery light was on and it read 13.5 volts not running and 650cca's which is much higher than the required. This leads me to believe there is definitely a bad ground somewhere which is causing irregular voltage spikes which is frying my PCM causing it to not read sensors properly and inadvertently frying my fuel pump. I am bringing it back into the shop and making my mechanic go over every area he worked on to make sure all the wires in those areas are good and grounded. I will keep updating until I resolve this.
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  #11  
Old 02-13-2015, 12:31 PM
tundrafox1 tundrafox1 is offline
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Default Re: 98 4.0 starting/stalling problems

How did it turn out? Sounds like you were narrowing the problem pretty effectively. Remember that the ECM only controls the engine and associated sensors, while the PCM is higher in the hierarchy. The ECM sends data to the PCM, which takes data from all other modules and sends feedback to cluster, etc. If the PCM was replaced incorrectly, or the new unit was bad, it will cause all the problems you mention, but it could still be a ground fault or short between wires...
I would venture that it is definitely narrowed to the PCM, and connected harnesses.
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