blazer acceleration

i have noticed a few people saying that if they floor their blazer the acceleration gets really slow at 30 to about 38 mph and then the shift is really hard or sometimes wont shift until you let off the gas a lil. Is this normal for everyone else?

No, I have a mutant truck. She downshifts into 1st and wears a 1/4" off the rear treads. I am glad too that GM usually ships sub-quality transmissions, think of all of the rubber trees they are saving! :iceslolan No, really man, take it back to the AAMCO shop and if you can, stuff it down their throats, they have done you a disservice IMO.

i have noticed a few people saying that if they floor their blazer the acceleration gets really slow at 30 to about 38 mph and then the shift is really hard or sometimes wont shift until you let off the gas a lil. Is this normal for everyone else?

Ever serviced the transmission?

New fluid and filter?

the transmission is completely rebuilt including these parts.......new assembly set, new III/Mercon ATF Fluid, 1 new band,new filter, 1 rebuilt torque convertor, clutch mub overrun, selenoids a and b, 1 new sun gear shell, and a transmission flush all in the last 3000 miles, still not performing liek i think it should

Take it back then.

You have a warranty.

well i cant take it back until my truck can make it up to the shop, if i give my blazer more than 2000 rpms it spudders and eventually just turns off after the check guages light comes on. Service engien soon light is on reads oxygen sensor bank 1 sensor 1, i am assuming and knock sensor which is probbaly being causes by low fuel pressure, autozone doesnt have a pressure reader to borrow for free and im not buying one, so i am just removing the plenum and hpoing it is the cpi, after putting in the new fuel pump and sending unit this has got ot be my problem i figure, it needing just a tune up would most likely not cause the vehicle to just shut off

You CPI injector is shot or the nut kit is leaking like mad.

i am doing a complete tune up right now as we speak, ill let you know how that works out

you have a listening problem?

I told you what the problem was, now your new plugs are going to be fouled with fuel from the leaking CPI.

Don't ask questions if you are not going to consider the advice.

It is a waste of time to the people contributing.

well smart ass i took it to the dealer today and the cpi is working fine ive had these blazer for 2 years and dont all the work on it myself plus a 6 inch lift, the only answers you have to everything is the cpi or ignition switch, so sorry your advice wasnt correct

well smart ass i took it to the dealer today and the cpi is working fine ive had these blazer for 2 years and dont all the work on it myself plus a 6 inch lift, the only answers you have to everything is the cpi or ignition switch, so sorry your advice wasnt correct

How did they inspect it?

Did they remove the plenum cover and look for leaking fuel?

yes theres was no fuel to be found what so ever, passenger side seemed to be a lot cleaner than the drivers side but not really clean, i think it may be a coil, i did a tune up and no help at all

yes theres was no fuel to be found what so ever, passenger side seemed to be a lot cleaner than the drivers side but not really clean, i think it may be a coil, i did a tune up and no help at all

If the driver's side is washed clean in area, your nut kit is leaking and should be replaced.

If there was no leak whatsoever, both sides should be totally black.

well the dealership i took it to my buddy owns it isint a gm authorized so i dont even know if his mechanic knew what he was talkin about but i got it looked at for free opposed to paying $60 but i guess that didnt help me at all. So what if the the passenger side looks wiped clean because i just tok the plenum off today and the passenger half looked pretty clean, not a lot of black on it at all really, so is this the cpi, because it my boat, after it got warmed up, if you gave it to much gas it would just quit and this was due to the ballist resistor and the coil, i ran the boat today and it ran liek a champ all day. I know theres a difference and boats and cars but mechanics are mechanics. So please tell me what a washed passenger side means.

" ... So please tell me what a washed passenger side means.[/QUOTE] ..."

you were told that 7 posts ago !

you're trying to hear what you want to hear!




well the dealership i took it to my buddy owns it isint a gm authorized so i dont even know if his mechanic knew what he was talkin about but i got it looked at for free opposed to paying $60 but i guess that didnt help me at all. So what if the the passenger side looks wiped clean because i just tok the plenum off today and the passenger half looked pretty clean, not a lot of black on it at all really, so is this the cpi, because it my boat, after it got warmed up, if you gave it to much gas it would just quit and this was due to the ballist resistor and the coil, i ran the boat today and it ran liek a champ all day. I know theres a difference and boats and cars but mechanics are mechanics. So please tell me what a washed passenger side means.

blazer lt said it was a nut kit if the drivers side was clean the passenger side is

Check my link out here:

http://www.s10forum.com/forum/showthread.php?t=113559&highlight=cpi+replacement

the passenger side is ??? ... the passenger side is what ??? ...


if your language skills and writing skills are any indicator of your mechanical skills --- well then, you have no hope of fixing your vehicle with the help of this forum or gaining any respect on this forum.




blazer lt said it was a nut kit if the drivers side was clean the passenger side is

If the passenger side is clean, that indicates a leak/fault in the fuel pressure regulator. At least, that is what I think you mean, gtboiii11. Please slow down and post coherent replies and questions - it will make our job of helping you easier. Make reference to Blazer's previous post of over a year ago on what to do when you find a washed intake plenum. There's about 10 pounds of free advice in a 5 pound bag in that thread.

patience is a virtue ...



If the passenger side is clean, that indicates a leak/fault in the fuel pressure regulator. At least, that is what I think you mean, gtboiii11. Please slow down and post coherent replies and questions - it will make our job of helping you easier. Make reference to Blazer's previous post of over a year ago on what to do when you find a washed intake plenum. There's about 10 pounds of free advice in a 5 pound bag in that thread.

lol well great i get to spend 300 tommorow on a new cpi i love putting money into my blazer, over 3k since ive owned it, after i replace the cpi i know i must have other problems too, the blazer has the slowest acceleration out of any vehicle i have ever driven, i mean when i floor the thing u can feel it drop down and just sits there and doesnt really accelerate, could the cpi be at fault for this also and will i see a big improvement when a new one goes in, under my plenum look almost identical the blazer lts pics.

o yes and i mean the passenger side of underneath the plenum looks washed sorry

lol well great i get to spend 300 tommorow on a new cpi i love putting money into my blazer, over 3k since ive owned it, after i replace the cpi i know i must have other problems too, the blazer has the slowest acceleration out of any vehicle i have ever driven, i mean when i floor the thing u can feel it drop down and just sits there and doesnt really accelerate, could the cpi be at fault for this also and will i see a big improvement when a new one goes in, under my plenum look almost identical the blazer lts pics.

yes, the cpi will cause that

your plenum looks very similar to mine, did you notice a very tiny difference after the effect of the new cpi kicked in or a rather large difference and does your blazer accelerate nicely or is it also pretty slow if your floor it?

large

no fuel, no performance

blazerlt do you have aim or yahoo

no, msn and icq

haha that figures, so where do u suppose i should turn after i install the cpi and nut kit and it doesnt fix the problem, im hoping it will but you never know on my truck and another quesiton is what year did u buy your truck and how much did u pay with how many miles and how much have u invested in repairs, i wanna see if i have invested a lot more compared to others

haha that figures, so where do u suppose i should turn after i install the cpi and nut kit and it doesnt fix the problem, im hoping it will but you never know on my truck and another quesiton is what year did u buy your truck and how much did u pay with how many miles and how much have u invested in repairs, i wanna see if i have invested a lot more compared to others

I bought mine used from my parents. Most of the expensive repairs were because of my father's improper repairs in the past. AKA, flywheel, starter, alternater.

I don't know where you could dump $3000 into it. I think you may need to find a new mechanic or learn to do some repairs on your own and not reply on expensive grease monkeys.

This will fix the problem. You best be getting it fixed and get the oil out of the crankcase seeing it is probably laden with fuel.

Repair BOTH the CPI injector AND the nut kit. Clean the EGR port in the upper plenum and make sure you use a fresh upper plenum gasket when putting it all back together. Also check all the vacuum hoses and replace if they are old.

only about 700 was labor from the 3000 and 550 of that was for the transmission rebuild in the past year i have installed myself, a 5 inch lift, 4 new shocks, new tires, new fuel pump sending unit and tank, new catalyic convertor, muffler and tailpipe, new fan clutch, new pads rotors, front stabilizer links, master brake cylinder, idoler arm, complete tune up yesterday and theres probably some stuff i am forgetting, the past owner took such terrible care of the blazer that it is costing me a fortune for maintenance she did not do in the past, her oil cooler went obviously undetected by her at 86k and she paid 3300 to have a brand new vortec put in and i paid 2800 for the truck about 2 years back so i guess i am paying for her mistakes but hoping the truck will be well worth it when i am finished o and by the way 1327 dollars of that 3000 was for the transmission rebuild and new torque convertor and o yea did i mention the cool part, the transmission cooler

A lot of those things can't be really seen as anything but routine maintanence.

The cat was probably ruined by the leaking CPI injector and nut kit and the new one will soon be ruined if you don't get it fixed.

bought the part today, its too hot to be outside and i didnt slept again last night so ill try to tackle it later tonight or tommorow

Did you buy the nut kit as well as the new upper plenum gasket.

well ive already had the plenum off once and replaced the seal then, i dotn know if it is reasuble because ive done that once on a neon and it sealed again fine, but i did pick up the nut kit, i might as well just buy a new plenum gasket because 12 dollars will save me aggravation, how much did you pay for your cpi i picked mine up new for 240 which is a fairly good price

Smart thinking, you want everything new so you know that everything is sealed tight.

Also, remember to clean the EGR port in the upper portion of the plenum that you remove.

yea egr valve has already been cleaned, before it was looked exactly like the one in your pic

Excellent, that will help.

Are you doing the work yourself?

If so, make sure you have some torx bits for the nut kit brace at the rear of the plenum.

yes im doin the work myself this is an easy job just a pricey part, i am most likely going to do it tommorow night, the truck is at aamco right now being looked at by another friend of mine becaus ehe has access to the computer scan tools, i dont know when the oxygen sensor comes up if it needs an oxygen sensor or if this is the cpi causing it, i bought anew one for him to replace it anyway, so when it comes back tommorow i am gunna tackle the job

yes im doin the work myself this is an easy job just a pricey part, i am most likely going to do it tommorow night, the truck is at aamco right now being looked at by another friend of mine becaus ehe has access to the computer scan tools, i dont know when the oxygen sensor comes up if it needs an oxygen sensor or if this is the cpi causing it, i bought anew one for him to replace it anyway, so when it comes back tommorow i am gunna tackle the job

Just be VERY careful when removing the poppets from where they enter the lower plenum. They are VERY brittle.

Also stuff shop towels down the 6 air tubes so nothing travels down into them by mistake.

ok just went up to aamco and talked to my buddy paul who owns the place, he said he looked at my truck himself and computer scanned it and says my problem seems to lie in the throttle position sensor, he said the sensor has gone bad and now the truck is not getting the fuel it needs when it needs it causing it to nto accelerate or even shut off, what do you think about what he had to say blazerlt?

ok just went up to aamco and talked to my buddy paul who owns the place, he said he looked at my truck himself and computer scanned it and says my problem seems to lie in the throttle position sensor, he said the sensor has gone bad and now the truck is not getting the fuel it needs when it needs it causing it to nto accelerate or even shut off, what do you think about what he had to say blazerlt?

It could be defective as well, but still you have a leaking CPI unit and nut kit.

It still has to be fixed.

blazerlt i replaced the cpi and nut kit, no difference have any other ideas?

forgot to add tp and 02 sensor just replaced, computer still reads knock sensor, could this one sensore be causing all my problems?

So you replaced the TPS?

And don't worry about the cpi and nut kit, it had to be replaced.

yea tps was replaced i am 100 percent fresh out of ideas except that knock sensor code

I thought you said the TPS was working fine.

tps was replaced because the computer scan came up as it being bad

So you have a defective knock sensor?

I would replace it. I am just starting to think this mechanic is taking you for a ride.

i dont know why he would be taking me for a ride he is a friend and im not getitng any labor charges so it would be a waste of his time to do so

ah, didn't know that.

so do you have any ideas?

replace the knock sensor

I just thought I'd mention that my jimmy was sluggish after the rebuild too. I think it took time for the vehicle to relearn its shift points or harshness or whatever(especially if the battery is frequently disconnected for all your repairs). Maybe it just needs some miles.

my mom has a blazer sport so on and so forth was having acceleration problems, and the tranny and the torque converter came up as issues both checked out fine. wanna know what it was the fuel filter. so unless thats new try that.

jade95

o believe me i have done all the simple things to try and fix the problem

Wonder if the new cat is already melted/blocked from the leaky fuel issue... that'll make an engine feel sluggish. I may be remembering incorrectly, but I think you can watch a vacuum gage during acceleration to see if your exhaust is restricted.

there is no fuel leaking issue and there wasnt one to begein with i just replaced the cpi because blaerlt thought that may have been the problem