Engine/Transmission (1998.5 - 2002) Can anyone diagnosis this problem?

[Koa Man]

My good friend emailed me today with the following message.



" I think I have a TPS or boost sensor or something acting up, because when I accelerated from a dead stop making a left turn into traffic the RPM’s would not pick up. I’m talking like the truck ran out of fuel and was not able to build boost and then finally it started to accelerate. This is not even close to turbo lag. I know and you know what turbo lag feels like and this was not it. I returned home and checked to see if the truck would accelerate under load by power braking. I mashed the peddle to the floor and nothing, well a slight increase in RPM, but not what should have happened. I tried it again for a longer period and finally the boost came up and the tires broke free. This is truly bizarre for me. I don’t remember if this has happened once before or not, but I have got to find the problem. Way to dangerous to drive around thinking you have all this power and then nothing when you really need it. "



I have only had a 24V for 2 months, so not at all familiar with its different problems. Told him I would post it on the TDR and see if anybody can help. His truck is a 2000 2500 4X4 auto. He has 275RV injectors, a VA stacked with the old Blue Chip box running at 15% and a Walker Airsep. I would appreciate any suggestions.

 

[Fishin Guide]

Do the easy stuff first.



Cycle the key on to off 3 times quickley, leaving the key in the on position. Do not start the truck! Read and record all the codes and get back to us.



Next, check fuel pressure. If it's low, change the filter. If it's still low, lift pump is gone or going.



What condition is the air flilter in? I saw one that was completely collapsed in the stock airbox. Pulled it and truck ran fine.



If it is dead pedal, it's likely the APPS or injection pump. If you get a 0216 code, that is pump death.



Dave

 

[Koa Man]

Thanks Dave,

I will forward that info to him and see what kinds of codes he gets.

 

[2-ND TIME]

Can anyone diagnosis this

If your friend can't have it fixed please PM me.

 

[Steve St.Laurent]

Have him pull the MAP sensor, clean it with brake fluid and then reinstall it. I recently had this exact same problem and I cleaned the MAP sensor and it solved it instantly.

 

[Koa Man]

He is going to check for codes. He said the fuel pressure is fine, he has a new Afe air filter, and the check engine light has not come on. I will tell to clean the MAP sensor.



I wish I knew more about the 24V engines. Just started reading the 24V forum after I got my '01 this past September. Already got it bombed pretty good... . it is like a rocket in 5th and 6th. I can only imagine what a 500 or 600 hp truck must feel like.