Engine/Transmission (1998.5 - 2002) engine hiccup!!!

[Cumminpwr11]

I was driving on the freeway with the cruise set at 70mph the engine kinda studdered, or missed, or... . well hiccuped.



A friend said it feels like the injector didnt get fuel like when your about to run out of fuel. but i had a full tank.



At first I thought it was a fluck, but its done it 3 time since. Any ideas what it is?



Anything would help



Thanks

Chris

 

[stevek]

When was the last time you changed the fuel filter? Did it do this right after getting fueled?

 

[Gary - K7GLD]

No "check engine" light, or codes set?

 

[Mark_Kendrick]

I've been having a TPS problem that resebles this. If you use a fueling box it is amplified.



I haven't fixed it but the TPS definitely seems to be MY problem.



FWIW,

Mark

 

[drice]

yours too

well I have 4 friends that have 24 valves that do teh same thing one of them just had the lift pump and injection pump replaced.



my dads was doing it for a while come to find out that the lift pump was going.

so my suggestion would be to take it in and have the stealer check the lift pump.

 

[Cumminpwr11]

I have two codes that just popped up.



P 1687

p 1693



any help with these codes.



Any one tell me how much a new pump might be. Waranty is long gone.



thanks chris

 

[Daddy]

My 99 has done something similiar for a long time. The first time it did it I was worried, but after reading on this site about others having this "stumble" I just learned to live with it. Its the kind of problem that is hard to track down and the dealer would probably just make worse. My truck might go for months without doing it and I dont think its ever done it more than once per tank. Its not related to the lift pump, I have a pressure gauge. It is a electrical glitch in the computer or a sensor. It has never set the check engine light when it happens. I know this hasn't helped but you are not alone, good luck.

 

[Gary - K7GLD]

HMMmmm - 1687 is a mystery:



"Metering Oil Pump Stepping Motor Circuit Malfunction "





1693 is a general fault error that points to the others:



"Turbo Charge Control Circuit Malfunction"



It is often found with a WIDE variety of errors NOT necessarily related to the turbo...





Good luck...

 

[LSMITH]

P1693

DTC Detected In Companion Module

DTC Detected In PCM/ECM



P1687

No MIC BUS Messages



This is what I came up with for the error messages. 1693 comes up on just about all of the error codes, it simply says that a code was recorded and points to no components. 1687 is a mystery to me.



My 99 has had a mystery stumble for a long time too. Just cruising down the highway it will feel like the engine is completely dead for a split second. By the time you look at the guages or anything else it is back to normal and cruising just fine. This is a common thing with the 24V trucks. If this is not what yours did there could be another problem. Maybe someone with a service manual can research the 1687 for you.



EDIT: my 99 is prior to the codes being available on the odometer so I have no codes when it has happened to me. I have had a scanner on it once and there were no codes stored. I nearly all of the "normal" hiccups there were no codes stored.

 

[thendrex]

Hiccup

I bought my truck with 85k on the odometer and I drove it til about 140k and the injection pump went out due to a bad transfer pump (lift pump). I took the truck to Cummins in Houston because at the time I could'nt make heads or tales of the problem. They replaced my injection pump and transfer pump, then that's when I started seeing the problem show up. It might go for a month without it showing up, then it gets you out of nowhere. I also get a *rump, rump, rump* in the morning when I put it in gear for the first time. Then thruought the day it will do it here and there, but not as bad as when I first do it in the morning... . Heck if I know... . if everyone else is seeing the problem then I'm notgoing to worry about mine anymore... .

 

[ACoyle]

I see this sometimes on cool (40 degree) damp mornings at first application of power. IE: just getting out of town.

 

[Summit]

might check the...

thendrex, and others who have the rump,rump,rump problem open your hood and check the ECM to PCM plug. its just above the valve cover and to the right. its a black plug with a white locking device that slides right (to open) left (to close). if the white bar is the open position and not ALL the way to the left (locked) truck will have these symtoms.

i've seen several trucks with this problem including my own,, aparently there was a good number of trucks that were shipped with the plugs not LOCKED. this problem usually sets a P1693.



later

 

[drice]

when we had my buddies injection pump fixed it cost right at 2,200 at the stealer. they ended up givign us the lift pump for raising so much cane about it. so I don't know how much the lift pump costs. hope this helps

 

[WadePatton]

TSB!!! (for intermittent engine stumble)



I forget the number, but it involves a reflash at the dealer. I had the same problem and went to a dealer with TSB in hand. In and out in 30 minutes, but they charged $60. I suppose it would have been warrantied if I'd let them take a week to diagnose it.



The reflash will also cut down the pre-start LP run time.

 

[thendrex]

Thanks Summit

Thanks for the heads up Summit, I'll look into that in the morning and see if that's it! I'm glad to hear it could be something that simple..... Oo.

 

[WadePatton]

TSB 18-24-99



http://dodgeram.info/tsb/1999/18-24-99.htm



Mine would cut out for a split second, every now and then--maybe once one week and 3x next week.



I quit worrying about it once I found the TSB and knew that it was a computer glitch. Sure enough, never stumbled since REFLASH AT DEALER. Got it done before UFM went on.

 

[dlauborough]

Chris... . I too am having the "stumble" problem. Mine has done this several times, & has died acouple of times also. My tach is playing mind games with me, it works most of the time, but usually within 10 or 15 miles it drops off to zero, then if it feels like it, it starts to work again. It seems the check engine light comes on when the tach dies. After being parked for a while the check light goes off, then when the tach drops again, the check light comes back on. I live out in the boonies, so I haven't had a chance to have it checked yet. Does your tach malfunction also?

thanks, Dale

















'99 3/4 AT LWB Quad. Stock.

 

[Mark_Kendrick]

Originally posted by dlauborough

Chris... . I too am having the "stumble" problem. Mine has done this several times, & has died acouple of times also. My tach is playing mind games with me, it works most of the time, but usually within 10 or 15 miles it drops off to zero, then if it feels like it, it starts to work again. It seems the check engine light comes on when the tach dies. After being parked for a while the check light goes off, then when the tach drops again, the check light comes back on. I live out in the boonies, so I haven't had a chance to have it checked yet. Does your tach malfunction also?

thanks, Dale



'99 3/4 AT LWB Quad. Stock.

The Tach problem is probably the crank position sensor or cam position sensor.



The 'stumble' that accompany's it is probably the ECM switching to a limp mode of sorts.



FWIW,

Mark

 

[Cumminpwr11]

thanks for all the help!!! I am gonna go get the flash and see if that helps





Chris