Engine/Transmission (1998.5 - 2002) Slow to accelerate on initial start up

[Renoram]

About 2 days ago I noticed that on initial start in morning or after the truck sits for a while, it is slow to accelerate (hesitates or bogs down) on the initial aceleration. It clears up after about 10-20 seconds then runs fine after that. I am getting normal fuel press- 12-14psi.



Is this a sign of something coming? I'm leaving on a 4200mile trip for 9 days Sat. & am a little concerned.



Any thoughts or help would be appreciated?

Thanks

 

[Bob4x4]

Check your boost sensor,they can fail with out se4tting any codes





Bob

 

[boydo]

APPS ( accellerator peddle postion sensor ) may be your problem - however it normally progressively gets worst and will throw a code ( from first problem to code 3 months or 25000 km driving before I got my code myself).



MAP ( manifold absolute pressure ) may need to be replaced.



IAT ( intake air temp ) may need to be cleaned or replaced.



Good luck.

 

[JHudson]

Check your MAP sensor, my 99 did the same thing and this sensor was the problem..... low voltage kept the computer from fueling until boost was up. $99. 00 at the dealer. Easy to replace.

 

[Not Guilty]

My 99 is doing the same thing...

Dumb question... How do you check the MAP sensor? Took it to a shop and there are no codes and fuel pressure is good.



Thanks

 

[Bob4x4]

You need to drive it with a monitor and watch the sensor voltage,knowing what it should be doing is the key



Bob

 

[willyslover]

also FYI. . the only dealer up there to use [if you have to use one] is Carson City Dodge. .

 

[JHudson]

Very easy with my setup. With the FMS, I just had to monitor the boost reading. I changed the resolution to tenths and after talking to Chip at Blue Chip, the box should start to fuel at around . 5 on the boost gauge. My MAP didn't allow fueling until around 7 on the gauge.



The neat trick that Chip taught me was I could "fix" the old sensor. All I had to do was remove and bend the diaphragm slightly by sticking a small screwdriver into the opening. Worked like a charm. I have been running this MAP sensor for six months, and truck is running great!



The price of a new one though, is only $99. 00 at the dealer.



Hope this helps

 

[Renoram]

Thanks, Guys for the inputs. I leave tomorrow for 4200 mile trip. Just hope it doesnt get worse until I get back!