# Chevrolet s10 4.3
**URL:** http://forum.driveonwood.com/t/chevrolet-s10-4-3/4977
**Category:** General Discussion
**Created:** [December 15, 2019, 4:38pm UTC](http://forum.driveonwood.com/t/chevrolet-s10-4-3/4977 "2019-12-15T16:38:46Z")
**Posts on this page:** 20
**Page:** 81
### Author:  [@ForbiddenTuna](http://forum.driveonwood.com/u/ForbiddenTuna)
#### Post date: [September 22, 2023, 4:28pm UTC](http://forum.driveonwood.com/t/chevrolet-s10-4-3/4977/1620 "2023-09-22T16:28:46Z")
Maybe with your birch the gas is more potent, and you could do with opening your air valve slightly?
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### Author:  [@Jan](http://forum.driveonwood.com/u/Jan)
#### Post date: [September 22, 2023, 4:33pm UTC](http://forum.driveonwood.com/t/chevrolet-s10-4-3/4977/1621 "2023-09-22T16:33:33Z")
There was soot on the valve, (I have never cleaned the intake), so the valve was almost stuck, so maybe it caused the engine to get too little air, it started to run more smoothly at idle now.
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### Author:  [@ForbiddenTuna](http://forum.driveonwood.com/u/ForbiddenTuna)
#### Post date: [September 22, 2023, 4:49pm UTC](http://forum.driveonwood.com/t/chevrolet-s10-4-3/4977/1622 "2023-09-22T16:49:01Z")
I don’t think my 2011 4.3 has this valve. I have a plastic intake so it is likely more convoluted in air flow for increased torque.
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### Author:  [@Jan](http://forum.driveonwood.com/u/Jan)
#### Post date: [October 5, 2023, 10:32am UTC](http://forum.driveonwood.com/t/chevrolet-s10-4-3/4977/1623 "2023-10-05T10:32:15Z")
Yes, ha, now it’s the same again, too high co values, does anyone have an idea what I should do?
The top paper is from the first time I inspected since then I have changed.
catalyst
pcv valve
temp sensor intake
map sensor
removed air filter.
When she inspected, the engine became ticking rattling at the 2500rpm test, when I then went home the engine light is on for something wrong with the erg valve, could it have something to do with the co level?
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### Author:  [@Woodrunner](http://forum.driveonwood.com/u/Woodrunner)
#### Post date: [October 5, 2023, 11:15am UTC](http://forum.driveonwood.com/t/chevrolet-s10-4-3/4977/1624 "2023-10-05T11:15:42Z")
Hi Jan, egr valves may affect the co-level, leaking, affecting the idle, not opening.
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### Author:  [@Jan](http://forum.driveonwood.com/u/Jan)
#### Post date: [October 5, 2023, 11:21am UTC](http://forum.driveonwood.com/t/chevrolet-s10-4-3/4977/1625 "2023-10-05T11:21:56Z")
I removed the erg valve, and it was stuck in the open position, due to a piece of soot, do you think this was the fault?
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### Author:  [@Woodrunner](http://forum.driveonwood.com/u/Woodrunner)
#### Post date: [October 5, 2023, 2:22pm UTC](http://forum.driveonwood.com/t/chevrolet-s10-4-3/4977/1626 "2023-10-05T14:22:01Z")
Hard to say, open egr valves can affect a lot of stuff, many new’er cars doesn’t run at all, mostly the idle and low revs are disturbed.
Do you know some smaller workshop that maybe have saved a co meter?
I have one, but it’s a little bit to far away.
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### Author:  [@Jan](http://forum.driveonwood.com/u/Jan)
#### Post date: [October 5, 2023, 3:15pm UTC](http://forum.driveonwood.com/t/chevrolet-s10-4-3/4977/1627 "2023-10-05T15:15:10Z")
I have tried to find a co meter but have not found one.
If I go to a workshop, it costs the same as an inspection.
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### Author:  [@JO\_Olsson](http://forum.driveonwood.com/u/JO_Olsson)
#### Post date: [October 5, 2023, 3:58pm UTC](http://forum.driveonwood.com/t/chevrolet-s10-4-3/4977/1628 "2023-10-05T15:58:29Z")
Jan, I forget, but did you ever install your pwm? At inspection I turn the pump voltage down until they are satisfied with their numbers.
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### Author:  [@Jan](http://forum.driveonwood.com/u/Jan)
#### Post date: [October 5, 2023, 4:18pm UTC](http://forum.driveonwood.com/t/chevrolet-s10-4-3/4977/1629 "2023-10-05T16:18:26Z")
No, I might have to install pwm.
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### Author:  [@Jan](http://forum.driveonwood.com/u/Jan)
#### Post date: [October 5, 2023, 4:33pm UTC](http://forum.driveonwood.com/t/chevrolet-s10-4-3/4977/1630 "2023-10-05T16:33:59Z")
Are you usually up for sales in Rättvik?
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### Author:  [@ForbiddenTuna](http://forum.driveonwood.com/u/ForbiddenTuna)
#### Post date: [October 5, 2023, 5:24pm UTC](http://forum.driveonwood.com/t/chevrolet-s10-4-3/4977/1631 "2023-10-05T17:24:57Z")
My friend has a 1989/1990 Jeep Cherokee Laredo that refused to run smoothly because the EGR was opening at idle. I blocked off the vacuum port to keep it closed and all is well.
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### Author:  [@Woodrunner](http://forum.driveonwood.com/u/Woodrunner)
#### Post date: [October 5, 2023, 5:58pm UTC](http://forum.driveonwood.com/t/chevrolet-s10-4-3/4977/1632 "2023-10-05T17:58:53Z")
That was my thinking, find a small village shop, cars,tractors,bicycle repair, where they could help you just check the co level for some kanelbullar/fikalängd 😀 or even let you borrow a co-meter, it’s not something you use everyday at shop’s, bigger workshops probably dont know what it is, only obd scannings for$$$.
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### Author:  [@Woodrunner](http://forum.driveonwood.com/u/Woodrunner)
#### Post date: [October 5, 2023, 7:07pm UTC](http://forum.driveonwood.com/t/chevrolet-s10-4-3/4977/1633 "2023-10-05T19:07:49Z")
I just checked, and i have 3 co-meters, this one is a spare, if i was sure it runs and measures correct, i could maybe send it to you Jan?
Free, ofcourse, i got it for free myself 🙂
Maybe something Dalarna woodgassers could split? 😃
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### Author:  [@Pelletpower](http://forum.driveonwood.com/u/Pelletpower)
#### Post date: [October 5, 2023, 8:32pm UTC](http://forum.driveonwood.com/t/chevrolet-s10-4-3/4977/1634 "2023-10-05T20:32:57Z")
😀😀😀made in W Germany. Please consider opening a museum. If Prof Balthazar doesnt have it, no one does.
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### Author:  [@Jan](http://forum.driveonwood.com/u/Jan)
#### Post date: [October 6, 2023, 5:23am UTC](http://forum.driveonwood.com/t/chevrolet-s10-4-3/4977/1635 "2023-10-06T05:23:06Z")
I would be very grateful if I could buy this from you, I have the same problem every year with the carbon content and never know if I’m doing something right, this year I changed almost all the sensors but to no avail, so possibly it’s the erg valve that messed up every year…
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### Author:  [@Jan](http://forum.driveonwood.com/u/Jan)
#### Post date: [October 6, 2023, 5:37am UTC](http://forum.driveonwood.com/t/chevrolet-s10-4-3/4977/1636 "2023-10-06T05:37:10Z")
@JO_Olsson , how far down can you get co levels with pwm?
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### Author:  [@ForbiddenTuna](http://forum.driveonwood.com/u/ForbiddenTuna)
#### Post date: [October 6, 2023, 11:05am UTC](http://forum.driveonwood.com/t/chevrolet-s10-4-3/4977/1637 "2023-10-06T11:05:21Z")
I would go ahead and replace that valve if it’s found to be malfunctioning. It’s part of the Emissions system.
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### Author:  [@JO\_Olsson](http://forum.driveonwood.com/u/JO_Olsson)
#### Post date: [October 6, 2023, 11:21am UTC](http://forum.driveonwood.com/t/chevrolet-s10-4-3/4977/1638 "2023-10-06T11:21:55Z")
> [@Jan](#):
>
> Are you usually up for sales in Rättvik?
You mean the market? No, I haven’t been in several years. Maybe I’ll get the time to when I retire 😄
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### Author:  [@JO\_Olsson](http://forum.driveonwood.com/u/JO_Olsson)
#### Post date: [October 6, 2023, 11:39am UTC](http://forum.driveonwood.com/t/chevrolet-s10-4-3/4977/1639 "2023-10-06T11:39:20Z")
> [@Jan](#):
>
> @JO_Olsson , how far down can you get co levels with pwm?
I don’t really know, but enough to pass the tests.
Also, the fuelpumps react differently to low voltage.The Volvo pump seems to deliver fuel pressure in proportion to the voltage, while the Mazda pump needs close to 12V to even start spinning.
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