Archived am I in limp mode? (sorry little long but really need help!)

[ScottWright]

Hey all,



So originally I posted the following, but since then I've put a fuel filter in, still didn't fix the problem. I unplugged all the FMS and Ez stuff, still no fix. Yesterday driving the truck suddenly wouldn't build any boost, wouldn't go over about 2000 rpm, and 40 mph. Now it even rev's slow in neutral. Did my truck kick into limp mode? The strange thing is, the check engine light has never come on even once?! I'm at a loss what to do next. Also just out of curiosity, has anybody had a lift pump fail, causeing the vp44 to fail, and still have the "*******" warrantee both after being BOMB'ed? Any suggestions where to go next? HELP PLEASE!!!!







"... I have a 2000 qc, 4x4, lwb, auto. I have an FMS and edge Ez on it. Today coming home from work I went to take off from a light and the truck bucked on accel. After that when I came to stop at the next light the truck was running terrible. It sounds like it is missing, but as soon as you either take off, or come to a complete stop (small load on motor) the miss goes away. It doesn't buck every time either. I was thinking maybe the lift pump was dying, but I got on it hard with the FMS on and it still pulled boost up to normal levels (37psi) The only thing I can think, and I guess this may be likely, Right before it bucked I filled it up with fuel. The first time it bucked at the stop light was only about 500' from the fuel station. Any ideas? Bad fuel? What do I do if I do have 36 gallons of bad fuel?!?!?! lift pump dying? injection pump dying? dirty fuel filter? I pulled the water drain up before I filled the tank, but nothing came out. Is this normal? I bumped the key once and fuel started pouring out immidiately. Could the water in the filter have been frozen or something? Sorry for so many questions, I'm just hoping it's not the VP44. The truck has had a lift pump put on it in the last 6 months. I have the psi sender that came with the FMS but it only tells if fuel pressure drops below 2psi. I just got the banjo this week so its' not been put on yet. HELP!! ... "



thanks,

scott

 

[kstehnacs]

It sounds like you may have a problem with the MAP sensor. I have seen a bad MAP sensor cause a similar problem a while back. It was intermittently reading low boost. Bad news is I don't know and way to check this without a scan tool.

 

[ScottWright]

bad news

bad news. . . scanned the truck yesterday and got the dreaded 0216 code. Guess it's time to go to the "dealership"



Thanks for the help though TDR!



Scott

 

[BillGotthelf]

Yup when I read your post I said VP44 dieing. Good Luck

 

[Catahoula]

How did you come out at the dealership? I am curious as my truck has been acting like yours for several months. It will run fine for maybe a day or two and then one day it will have the following spell. The ehhaust temp and the boost guages will "FREEZE" in place and the truckwill only build limited boost. It always varries as to the amount of boost it will actully build. (the guage does not change, nor the E temp guage) After several miles of driving it may suddenly jump back to normal and the guages go back to correct readings. Some time I have to stop and kill the truck and restart it to correct the problem. Sometime I have to wiggle and shake all the wires, turn the truck off and set for two minutes and all will return to normal. It may pull hard for 300 miles and never do this or it may have a spell 25 minutes after I start down the road. Sometimes I can Key the CB radio and the truck stumbles and the guages will freeze and I have to go through the ritual to get the truck back to normal. Some one must know what causes this!

 

[mmclaughlin]

Catahoula -



There is a tread that talks about checking the gounds on the truck - might be the same problem you're having. I'll see if I can come up with it.



- M