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2nd Gen Ram Tech 1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.

Guys please help...... Starting Issues

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Old 03-24-2014, 11:37 AM
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Default Guys please help...... Starting Issues

Hi guys I am new to this so please just bear with me!!!!!

I have a 98 Dodge Ram 1500, 5.2, 4 wheel drive, 172,000 miles on the clock.

I started the truck one morning and left it running on my driveway so I could let it warm up. Came back out about 5 minutes later and truck had stopped running. I cranked and cranked and no luck. Sprayed a little of starting fluid into the throttle body and it fired up but died instantly. So I figured I had a fuel problem. I honestly couldn't hear the fuel pump prime so I immediately thought it was the issue. Ordered a new pump, installed it and still no luck???? I am wondering if I could have a clogged up cat??? I took out the 02 sensor that goes on to the cat relieve some pressure but it really didn't make any difference. There was only one DTC(p0138) before all of this happened????????

Please any advice would really help............
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Old 03-24-2014, 11:43 AM
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Put a gauge on it, and see if you are actually getting fuel pressure.

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Old 03-24-2014, 11:59 AM
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Thank you for the welcoming....

I was able to borrow one from Autozone and the readings were=

35psi at just priming...
49psi while the truck runs.. for a couple of minutes that is, it's a brand new pump so I don't understand why it acts like it is starving for fuel???
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Old 03-24-2014, 12:02 PM
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Remove the front O2 sensor from the cat, see if it runs any better.
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Old 03-24-2014, 12:12 PM
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I removed it last night to try to relieve some of that back pressure out if there is any??? I was thinking it might be the catalytic converter. It ran a little better but it is still the same issue. Cat was replaced about 2 years ago, one thing I forgot to mention is that when it does start up I try to raise the RPM's and truck starts bogging down.
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Old 03-24-2014, 12:20 PM
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Possible throttle position sensor?

Fuel pressure is correct for your truck.
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Old 03-24-2014, 12:27 PM
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Would the tps sensor cause a no start condition? And could I just do a resistance check?
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Old 03-24-2014, 02:14 PM
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Any suggestions guys???
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Old 03-24-2014, 03:25 PM
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If it was WAY out of range it might.

I would test voltage. Should be less than 1 at closed throttle, better than 3.5 at WOT, and it should progress SMOOTHLY all the way in between.
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Old 03-24-2014, 10:41 PM
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Default Might be the issue?

Ok hey you. So I tried doing a voltage test for the tps wiring harness, set it to volts DC, connected the ground lead of the multimeter to the ground on the battery, turned the key to the on position and started testing each wire. I know the middle connection is the signal wire, which tested to 0 volts but the black wire on the left had a little less than 1 volt and other wire on the right isn't giving anywhere near to 5 volts, it is also shorting out somewhere, everytime I make contact it resets everything on the dashboard and relays under the hood click. Am I doing this right?
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Old 03-24-2014, 11:12 PM
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All I was checking was to see if the 5 volts are being supplied to the sensor, is it better to just reconnect the wiring harness and back probe the sensor on ground and signal??? Also is the violet/white wire the 5v reference wire?

Thanks for the help.
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Old 03-25-2014, 09:10 AM
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The ASD relay will only stay engaged for about three seconds after the key is turned on. So, that sounds reasonable normal.

On the connector, (while plugged in.....) should get 5 volts on the Violet with white trace, Orange with dark blue trace is signal wire. That's the one ya wanna test. You should see voltage there with ignition on. (5 volt sensors are always powered with key on) Set your meter on like the 10 volt scale, too high, and it may not register.

If you aren't getting anything there, unplug it, and verify 5 volts on feed wire.

You are testing the right way.
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Old 03-25-2014, 11:48 AM
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Alright I will check that out today. I will get back to you.
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Old 03-25-2014, 06:30 PM
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Alright! So I tested the sensor and it seems ok, double checked the fuel pump to make sure I installed it correctly and check filter and it all seems fine. TPS was at .641 volts on closed throttle and around 3.75 on WOT. Engine turned over and finally fired up, it's was sitting for 2 days not wanting to start. Today it ran but only for about 6 to 7 minutes and shut off on her own again. What could cause this??? It loaded 4 different DTC's all related to the 02 sensor though, it's unplugged so that's probably why. I am really wondering if I have a bad cat??? I can't think of anything else???

Help////
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Old 03-26-2014, 10:52 AM
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I have noticed it shuts off when it reaches normal temperature, could it be a bad ECT sensor? It's not overheating though...
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Old 03-26-2014, 12:19 PM
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What year is your truck? (that info really should be in your sig, and profile)

98 and newer trucks only use one sensor, so, if yours is newer, and the gauge reads right, the sensor is probably ok. 97 and older use two, so, need a scanner to see what the sensor is telling the PCM.
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Old 03-26-2014, 04:01 PM
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Yeah sensor seems fine. I have been looking around for any major vacuum leaks. Traced down the hose that goes from Purge Solenoid all the way back to the Evap Canister, the line that goes from the Canister to the line for the fuel tank was not connected, so I plugged it in. Kept looking while I was down there I found what seems like a vacuum hose coming from the front axle. I think it is the 4 wheel drive actuator? But the hose is not connected to anything. It's about 3 feet long, can't figure out where this plugs into?

Thanks for replying back Hey you.
Oh by the way it's a 98 Dodge Ram 1500, 5.2, 4 wheel drive.
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Old 03-26-2014, 04:12 PM
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If any ideas plz let me know...

Thanks
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Old 03-26-2014, 04:59 PM
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there is a connector with 2 vac lines that come off of the actuator on the axle and they run into the switch which will be on the driver side of the t-case. the switch should have 4 lines runnin into it. 2 from the axle and 2 come from the tranny I believe. they all meet up to the switch through a boot rubber like connector if I remember right. its kinda a pain to reach but it can be done. the shift linkage is kinda in the way.


but either way, those lines shouldn't have anything to do with your truck dying. have you checked your MAP sensor on the throttle body?
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Old 03-26-2014, 09:26 PM
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The farthest I got was just unplugging the MAP sensor and tried starting the truck but no luck. I am gonna test it next, but I wanna rule out the catalytic converter so in order to do that I am gonna do a back pressure test. When truck does fire up and runs, it only does for about 10 minutes then slowly RPM's start dropping while idling, truck bogs down and dies. It has a brand new fuel pump, pressure regulator and filter so I don't think it's a fuel problem. Also another thing I forgot to post was that it gives me a P0141, this is the sensor behind the catalytic converter. Would you guys agree with that?
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Old 03-26-2014, 09:26 PM
 
 
 
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