Is this normal? 2nd gear acceleration.
Hotshot
Joined: Sep 2001
Posts: 11,958
Likes: 228
Thats ok, When I asked does it feel like its bogging down means that something is restraining the engine. If it is just reving the engine will sound the same but you don't feel it moving the truck.
As far as powerband goes, what you just stated is what I was talking about.
Has your transmission ever been serviced? If so, I would keep a good schedule of servicing it. If it never has then maybe leaving it untouched is the best thing. Pull the trans dipstick and see if the fluid is red or brown.
As far as powerband goes, what you just stated is what I was talking about.
Has your transmission ever been serviced? If so, I would keep a good schedule of servicing it. If it never has then maybe leaving it untouched is the best thing. Pull the trans dipstick and see if the fluid is red or brown.
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Post Fiend
Joined: Jan 2007
Posts: 7,021
Likes: 5
From: Almost Heaven
Thats ok, When I asked does it feel like its bogging down means that something is restraining the engine. If it is just reving the engine will sound the same but you don't feel it moving the truck.
As far as powerband goes, what you just stated is what I was talking about.
Has your transmission ever been serviced? If so, I would keep a good schedule of servicing it. If it never has then maybe leaving it untouched is the best thing. Pull the trans dipstick and see if the fluid is red or brown.
As far as powerband goes, what you just stated is what I was talking about.
Has your transmission ever been serviced? If so, I would keep a good schedule of servicing it. If it never has then maybe leaving it untouched is the best thing. Pull the trans dipstick and see if the fluid is red or brown.
Feels like something is restraining the engine at this point. Tranny downshifts and the RPM's drop, but they don't jump back up and my truck doesn't MOVE like it should. It feels like I'm pulling a heavy load up hill.
Again, I ran my truck hard today and couldn't get the truck to fall on it's face today. What in the world?
When I get some time and get to mess around with my truck some more I'll post my results on here.
I hope it's a cheap, easy fix.
Hotshot
Joined: Sep 2001
Posts: 11,958
Likes: 228
I would never use that transmission flush crap. I was just talking about dropping the pan and changing the filter. Of course you will have to replenish a few quarts of trans fluid.
I would try to pull codes again. Maybe the injectors are dirty.
I would try to pull codes again. Maybe the injectors are dirty.
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Post Fiend
Joined: Jan 2007
Posts: 7,021
Likes: 5
From: Almost Heaven
What do you think of Gumout injector cleaner? The type you put in your fuel tank.
Elder User
Joined: Nov 2006
Posts: 973
Likes: 2
From: Texas
Ok, sounds like we need to clear up some of the issues.
When a tranny downshifts (3rd to 2nd) the engine rpm's will increase(tranny does this under hard acceleration from higher speed)
when the tranny down shifts(2nd to 3rd) the engine rpms decrease(does this once youve reached highway speeds) . If the engine is bogging down at higher rpm then there is an issue.
the I6 loves low rpm but will produce lots of power up to around 3500 rpm, and its usually not as slow as most assume.
Have you tried shifting with the shifter, Moving it from 3 to 2 and see how it feels.
When a tranny downshifts (3rd to 2nd) the engine rpm's will increase(tranny does this under hard acceleration from higher speed)
when the tranny down shifts(2nd to 3rd) the engine rpms decrease(does this once youve reached highway speeds) . If the engine is bogging down at higher rpm then there is an issue.
the I6 loves low rpm but will produce lots of power up to around 3500 rpm, and its usually not as slow as most assume.
Have you tried shifting with the shifter, Moving it from 3 to 2 and see how it feels.
Lead Driver
Joined: Feb 2003
Posts: 8,140
Likes: 4
From: Oak Harbor, OH
BG is the best. The gumout is OK, but you'll need the super concentrated stuff. It sounds to me like it's just tired. Put a vacuum gauge on the engine and power brake it. Watch the vacuum. It should have ~18inHG at idle and remain steady. It will fall when you open the throttle and should bounce back up again. If it waivers or doesn't come back up you might have a bad valve, or even bad rings. The air bag and engine control are two seperate computers, so the code for the horn/air bag is NOT going to interfere with the engine's computer. Pull those codes. NO exhaust shop is going to remove a catalytic converter. It's HUGE fines and they'll lose their license. The TPS sounds logical, but the more you talk about how it's running on the rear tank leads me to believe you have a weak fuel pump.
Cargo Master
Joined: Jun 2002
Posts: 2,033
Likes: 32
From: Aurora,Colorado
I would suggest programming the speedo/odometer( PSOM )for the 31 inch tires-if this hasnt been done already. The programming of the auto trans and the engine is influenced by the computer's perceived speed of the vehicle. This reprogramming of the PSOM is no cost and would need to be done to true the speedo/odometer anyhow.
The truck's computer may not know the true speed/load of the vehicle and cause these problems that you have detailed concerning the engine and transmission response.
The truck's computer may not know the true speed/load of the vehicle and cause these problems that you have detailed concerning the engine and transmission response.
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Hotshot
Joined: Sep 2001
Posts: 11,958
Likes: 228
I agree about the PSOM reprogramming. I don't think it would cause as much of an issue as he has described though.
However I had 31 inch tires on my truck for about 8 years. I don't anymore, but I never had much of an issue and I didn't reprogram the PSOM. I think it is much more necessary when going to 33 or larger tires.
However I had 31 inch tires on my truck for about 8 years. I don't anymore, but I never had much of an issue and I didn't reprogram the PSOM. I think it is much more necessary when going to 33 or larger tires.
Lead Driver
Joined: Feb 2003
Posts: 8,140
Likes: 4
From: Oak Harbor, OH
THe stock tires are 29.6 inches in diameter. The 31s are pretty close, I do know that when I put some used 215/75/15s on a '92 E150 it ran like poo. I lost a lot of acceleration. I replaced them with the proper tires and it cleared up. What happens is the computer thinks you are moving faster or slower than you really are, and doesn't compensate well.
Junior User
Joined: Apr 2008
Posts: 93
Likes: 0
i really wish i could help, but advice from a 302 owner wouldnt do much good, but i asked my dad he says coils, now i dont have much experience with the ignition system of a truck but anythings plausible with thtis strange predicament. i dont see how a tire thats only 1 inch taller would affect the PSOM, care to explain? im not being rude but i would like to know the theory of this.
Super Moderator
Joined: Apr 2004
Posts: 34,499
Likes: 2,811
I understand, but my RPM's are IN the powerband.. Unless we exclude horsepower? Torque is what moves the truck after all. Maybe my thinking is all wrong; I consider my powerband to be up to 3,400. My torque is maxed out by 2,000. If I rev past 2,000, will my truck bog down in second gear?
The tranny feels good, thank God. It's not in the best health but it's not slipping yet.
I apologize, can you please rephrase this? "Does it feel like its bogging is just reving? " I'm really tired and don't understand the question.
The tranny feels good, thank God. It's not in the best health but it's not slipping yet.
I apologize, can you please rephrase this? "Does it feel like its bogging is just reving? " I'm really tired and don't understand the question.
You're on to something with the difference between tanks.
This problem has nothing to do with the rpm range you are running in, nor does the torque vs. hp curve cause this.
Your torque peak of 260 lb/ft is at 2000 rpm, right where your downshift should take you, see previous post. You make 99 horse there. Your HP peak of 150 at 3400 requires torque of 231 lb/ft, so torque is holding fairly flat as the revs go up, building horsepower. Your acceleration should be smooth and increase as the revs increase up to 3400 and a tic beyond. Automatics love flat torque curves.
Anyway, wandering off the original topic and problem here. Focus on the fuel situation, pumps, filter, tps etc, I think you'll get it. Good luck.
Cargo Master
Joined: Jun 2002
Posts: 2,033
Likes: 32
From: Aurora,Colorado
i really wish i could help, but advice from a 302 owner wouldnt do much good, but i asked my dad he says coils, now i dont have much experience with the ignition system of a truck but anythings plausible with thtis strange predicament. i dont see how a tire thats only 1 inch taller would affect the PSOM, care to explain? im not being rude but i would like to know the theory of this.
Anyone can tell you that acceleration is noticeably changed when going from 235s to 31s on these trucks. He needs to have the computer programmed for actual speed and not perceived speed. And the 31 inchers weigh 10 pounds more each tire-- than the 235s and this added weight acts like a flywheel weight when acceleration is considered.
Mustang owners can have driveability issues when changing axle ratios and tire sizes with their SD EFI 5.0s with autos. I was just thinking that this issue could also be the cause with this truck.
I suspect that checking the manifold vacuum as someone already suggested would be a good idea. A clogged cat/constricted exhaust system could cause this issue also.