Calling all the kings men - 2.2L loss of power? - S-10 Forum
 
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post #1 of 12 Old 02-05-2019, 09:23 AM Thread Starter
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Calling all the kings men - 2.2L loss of power?

2000 S10 | 2.2L Flex | 5-speed

Need a little help troubleshooting an issue.

Codes:
P0410 - Secondary Air Injection System
P0141 - Down Stream o2 sensor
P0446 - Evaporative Emissions System Vent (this code has been on for 70k miles. I rebuilt the engine and this is the only code I havent been able to take care of)

Symptoms: Slight loss of power under load

Advice so far: Autozone's code reader recommended to replace the SMOG pump (air recirc pump)

A little back story.


The other day I towed a small car about a mile. Kept it in 2nd and third gear.
After I did that, it felt like something was slipping but overall drove normally.
So originally, I thought I might have hurt my transmission towing as the car started to act up about 3/4 mile into the tow. Loss of power...


Last night I was driving up a fairly large hill when my truck bogged down/suffered a minor loss of power for a brief couple of seconds and then surged to normal power.


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post #2 of 12 Old 02-06-2019, 02:13 PM Thread Starter
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Re: Calling all the kings men - 2.2L loss of power?

So my truck decided to start idling a little rough last night. I am likely going to replace the SMOG/AIR pump. How critical is it to use the hoses specified in the TSB?
Could a bad downstream o2 sensor cause a p0410 or would the p0410 cause the bad o2 sensor code?

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post #3 of 12 Old 02-06-2019, 06:09 PM
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Re: Calling all the kings men - 2.2L loss of power?

smog pump wont cause that...

I dont drive Chevys anymore....


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post #4 of 12 Old 02-07-2019, 01:52 PM
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Re: Calling all the kings men - 2.2L loss of power?

I would at least test the air pump before replacing it...




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post #5 of 12 Old 02-07-2019, 03:15 PM
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Re: Calling all the kings men - 2.2L loss of power?

a few questions- is the cat original? have you check your exhaust for pin holes/gasket leaks- have you checked you intake/tb for gasket leaks? have you done a fuel pressure test and when was the fuel filter changed last?

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post #6 of 12 Old 02-13-2019, 04:25 PM Thread Starter
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Re: Calling all the kings men - 2.2L loss of power?

Quote:
Originally Posted by Jayhawke View Post
a few questions- is the cat original? have you check your exhaust for pin holes/gasket leaks- have you checked you intake/tb for gasket leaks? have you done a fuel pressure test and when was the fuel filter changed last?
Fuel pressure was 50-55 PSI when I checked last year.
O2 sensors are only a few years old.
Cat convert is a year or two old.
(Complete engine rebuild in 2015)

Got a working smog pump from the junkyard for $20. Currently running without it. Ill keep y'all updated.

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post #7 of 12 Old 02-25-2019, 10:04 AM Thread Starter
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Re: Calling all the kings men - 2.2L loss of power?

Update:

I got around to replacing the smog pump with a working one I found at junkyard. Seems to have taken care of the rough running and the various codes.

Still have a p0446 but is likely the fuel pressure sensor (ive replaced majority of vacuum hoses)

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post #8 of 12 Old 03-11-2019, 10:16 AM Thread Starter
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Re: Calling all the kings men - 2.2L loss of power?

So the p0410 came back. Replaced the check value. p0410 hasnt come back (need to check again as p0446 is my eternal PITA).

While I was in there, I noticed that the plug on cylinder 4 was loose. Tightened it down.

Plugs (ACDelco) and wires (Duralast) are new and have about 12,000 miles on. Car runs fine on flat stretches, but struggles bad on hills. I know this truck is weak on power, but it seems weaker than ever. Not getting any misfires.

Where do you think I should start?

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post #9 of 12 Old 03-11-2019, 01:12 PM
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Re: Calling all the kings men - 2.2L loss of power?

When was the last time the fuel filter was replaced?

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post #10 of 12 Old 03-11-2019, 01:53 PM Thread Starter
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Re: Calling all the kings men - 2.2L loss of power?

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When was the last time the fuel filter was replaced?
Less than a year. About 12k miles ago.

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post #11 of 12 Old 04-18-2019, 01:21 PM
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I had a similar situation a while ago and I went through a ton of fun. My truck would drive great as long as I didn't need to pass or put it under load. I also noticed that the voltage was dropping when I experienced the power loss. I ended up changing the belt tensioner and I replaced the little rubber grommet at the alternator clip/connection. Might be worth looking at?
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post #12 of 12 Old 05-08-2019, 10:54 AM Thread Starter
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Re: Calling all the kings men - 2.2L loss of power?

Update: hooked up a scan tool and the o2 sensor was reading a constant .45v.
Crawled under the truck and found the o2 sensor wire was loose. All is good now.

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