95 Blazer loss of power

:smile: I have a Blazer S 10 model 95, motor Vortec 4.3 LT that had the following problems: irregularity in the RPM; turn off during the march and it didn't start sometimes. The gas pump was changed when finding it low pressure. Now with the new gas pump and the new gas filter, frequently the motor doesn't respond with the correct power when hurrying; it ascends up to 3000 RPM or less and doesn't acquire power or acceleration, but previously it was working correctly and later it works correctly again, although it follows presented irregularity in the RPM. Injectors neither CPI or Nut kit have not been revised. The new gas pump is: AIRTEC NUMBER CATALOG E3270. What can I make? Please help me.

I would look to the CPI and nut kit

yip, remove your top vortec name plate and the round IMTV valve underneath it.

Then take a flashlight, shine it down the hole and look for the smell of gas, pools of fuel and washed spots that will be a golden color.

We had a similar problem with our 95 Blazer and it turned out to be the Catalytic Converter. My Husband replaced it and it runs great!!!

I have a Blazer S 10 model 95, motor Vortec 4.3 LT that had the following problems: irregularity in the RPM; turn off during the march and it didn't start sometimes. The gas pump was changed when finding it low pressure. Now with the new gas pump and the new gas filter, frequently the motor doesn't respond with the correct power when hurrying; it ascends up to 3000 RPM or less and doesn't acquire power or acceleration, but previously it was working correctly and later it works correctly again, although it follows presented irregularity in the RPM. Injectors neither CPI or Nut kit have not been revised. The new gas pump is: AIRTEC NUMBER CATALOG E3270. What can I make? Please help me

Have you checked your spark plug wires? check your injectors and also you might have a bad inlet manifold gasket. I would recommend you install and original AC pump.

Thank you for your answers to rlith, BlazerLT, Cherid and Minkles. Work carried out: The mechanic retired the top vortec name plate, but later he also preferred to move away the entire cover of the “dynamic camera” to observe the Nut Kit and the CPI. The interior of the cover of the camera where is the valve butterfly of entrance of air and the whole internal surface of the camera where is the Nut Kit and the CPI presents great quantity of black deposits stuck to the metal and the whole surface of the Nut Kit and of the entrance hoses and exit of fuel. I will take a picture to send it. The six circular conduits that go to the combustion cameras also present the black deposits and additionally there is a layer of oil on the whole surface (the vehicle has been consuming oil in remarkable quantity and does it leave blue-white smoke when it start up in the morning). Is it possible that additionally there is a problem of guides of valves?. Or of rings?. With which product should be cleaned the black deposits?, The mechanic has proven to clean the interior of the cover with the product of 3M “Throttle plate & Carb Cleaner” with good result. Is this product correct for it? How to avoid that the dirt passes to the combustion cameras? Can it retire completely the Nut Kit to clean it? Should the gasket be changed when reinstalling the pieces? Can a seal be used on the gasket? How many injectors does have this motor? How are the injectors regulated so that it consummates less combustible?. Excuse me for so many questions but I desire to conserve this excellent vehicle. Thanks to all.

so there is no washed clean spots with metal exposed?

Dear BlazerLT
I believe that I didn't understand their question well. The interior stains, where are CPI and Nut Kit not have been washed yet. The test of cleaning carried out in small parts of the cover with the 3M “Throttle plate & Carb Cleaner” result in a complete cleaning of those small parts.

Dear BlazerLT
I believe that I didn't understand their question well. The stains not yet have been washed.

No, what I meant was there any leaking gas in the plenum causing the black stuff to wash off in areas.

OK, Understood. The cause of the black material is escape of gasoline. Do you suggests that it can be faulty of the Nut Kit or to have escape for some of the hoses?. What can you comment me about the presence of oil in the compartment? Thank

No, if you have an injector leak, some of that black soot in the upper plenum will be washed off in areas.

Is the inside complete covered with black soot? No clean areas?

I send a picture:
Superior view of the compartment of CPI and Nut Kit of Blazer 95 with black deposits.

http://files.automotiveforums.com/gallery/showphoto.php?photo=45100

http://files.automotiveforums.com/gallery/showphoto.php?photo=45100

Superior view of the compartment of CPI and Nut Kit of Blazer 95 with black deposits.

You see where the metal inside has been washed clean? You need to replace your CPI injector and the nut kit.

That is the cause of your performance problem.

You see where the metal inside has been washed clean? You need to replace your CPI injector and the nut kit.

That is the cause of your performance problem.
:smile:
Understood totally. Thank you for your answer. I will inform you of the results. Thank you.

:smile:
Understood totally. Thank you for their answer. I will inform you of the results. Thank you.

You do know what I am talking about right?

The injector is the whole assembly.

Here is where you can see when I replaced mine:

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

You see where the metal inside has been washed clean? You need to replace your CPI injector and the nut kit.

That is the cause of your performance problem.

Excuse my for this question: the injectors are inside the body of the Nut Kit? (named “spider” in my city). Thank you

Oh!., This question was previous to your last answer. You had been advanced to the answer. I understood your technical instruction perfectly. The black deposits are relatively "normal" and the areas where the surface are cleans indicate that there is a loss of fuel for the system. I already saw your pictures and instructions in http://www.s10forum.com/forum/showt...cpi+replacement.
A thousand thank you.

No problem.

As you will see in the link I gave you, you will see the new white lines which supply fuel to the injector. These are called the "Nut Kit".

The CPI injector is called the spider.

Replace both and make sure your mechanic cleans that EGR port that I showed you in that link.

What you will need to replace:

CPI Injector (spider)
Nut kit
Upper plenum gasket (don't reuse the old one)

Also, change your oil as soon as possible. The fue leaking out of the injector will go into the oil which will thin it out and cause oil related bearing damage.

Ok, BlazerLT. Everything understood.
Alone that the pieces are quite expensive in my country; for example, the CPI (spider) it is difficult to get and it costs between 450 and 650 dollars, and the hoses (white as those of your car) are not gotten.

On purpose, the mechanic carried out the verification indicated in your link with the old kit that is still installed, opening the switch and indeed there is leak of fuel. The exact place of the leak was difficult to observe with the installed kit, seemingly it is between the regulator and the body of the spider or possibly for some of the hoses of the injectors, in the place where they emerge of the body of the spider, but there is not leak properly for the hole of the end of the regulator.

I am in the process of getting the pieces for the repair. I will change the oil, the oil filter and the upper plenum gasket (¿Is the upper plenum the same dynamic chamber?).
Thank you.

Is the upper plenum the same dynamic chamber?).

I don't know what you are asking, please clarify.

Perhaps by "Dynamic Chamber" he means if the upper plenum icorporates the IMTV?

I don't know what you are asking, please clarify.
Ok. It is not very important. I meant that the compartment where are the injectors and the Nut Kit is called the “dynamic chamber” by the mechanic and I wanted to know if it is the same thing the "upper plenum". Thank you

Ok. It is not very important. I meant that the compartment where are the injectors and the Nut Kit is called the “dynamic chamber” by the mechanic and I wanted to know if it is the same thing the "upper plenum". Thank you

Yes

:grinyes: :uhoh:
Repairs and changes carried out:
Was replaced the CPI, Nut Kit, gasket, motor oil, filter oil, distributor rotor and spark plugs.
Now the engine responds with the appropriate power.
However, the engine presents irregularity in the minimum march (ralenti) and also when it ascends around 2000 rpm; seemingly as if a spark plug didn't work, but the spark plugs and the wires work correctly.
The mechanic cleaned carefully and correctly the surface of the upper plenum and he installed the gasket but he didn't apply it seal and I have the impression that air can be entering for the assembly. (The box of the new gasket contains a seal tube). What do you think about that?
Thank you

Oh!., as you can observe in the picture that I sent (link below), this engine doesn't have EGR valve; where the EGR valve should be, there is a cover with two screws. Anyway, the hole was cleaned completely.
http://files.automotiveforums.com/gallery/showphoto.php?photo=45100

Link to picture doesn't work. Here's the pic:
http://files.automotiveforums.com/gallery/data/503/353020Motor_Blazer_95.jpg

Thank you blazee for your help. I already corrected the link to picture.

:grinyes: :uhoh:
Repairs and changes carried out:
Was replaced the CPI, Nut Kit, gasket, motor oil, filter oil and spark plugs.
Now the engine responds with the appropriate power.
However, the engine presents irregularity in the minimum march (ralenti) and also when it ascends around 2000 rpm; seemingly as if a spark plug didn't work, but the spark plugs and the wires work correctly.
The mechanic cleaned carefully and correctly the surface of the upper plenum and he installed the gasket but he didn't apply it seal and I have the impression that air can be entering for the assembly. (The box of the new gasket contains a seal tube). What do you think about that?
Thank you

Oh!., as you can observe in the picture that I sent (link below), this engine doesn't have EGR valve; where the EGR valve should be, there is a cover with two screws. Anyway, the hole was cleaned completely.
http://files.automotiveforums.com/gallery/showphoto.php?photo=45100


Unless the EGR was deleted from the ECM (unlikely) that may be causing your stumbling acceleration.... The egr is there for a reason. You can restrict it, but it shouldn't be removed!

Unless the EGR was deleted from the ECM (unlikely) that may be causing your stumbling acceleration.... The egr is there for a reason. You can restrict it, but it shouldn't be removed!

This absence of EGR is original of factory of the vehicle. It has not been altered.

I've never seen a CPI engine without an EGR manufactured for canada or the US...

This vehicle is originally assembling in Venezuela and import to Colombia.
Please: Which is the torque of the screws of the upper plenum?. Does the upper plenum gasket need seal? Thank you

8 ft pounds torque in a circular (not cross) pattern. Start at 7 o'clock and work your way around. No, the gasket doesn't need sealent. Just drop the gasket on and tighten bolts.

A new revision of the electric system finished in the necessity to change the wires of the spark plugs. Fact this, the vehicle works perfect. Thanks to all who helped me in this difficulty, you are experts.