1993 Isuzu Rodeo 3.2L V-6

[GEN XER]

What is an EGR Transducer. My check engine light came on for the first time in 230K miles. The dealer says its the transducer. I dont know what this part is or where its located on the truck. All I know is the part is $206 and labor is $300 of which I dont intend to pay. Can I get some help?

[trooperbc]

Originally Posted by GEN XER

What is an EGR Transducer. My check engine light came on for the first time in 230K miles. The dealer says its the transducer. I dont know what this part is or where its located on the truck. All I know is the part is $206 and labor is $300 of which I dont intend to pay. Can I get some help?

it's the egr backpressure transducer. it's part of the egr system. the egr valve has a port that looks like a vacuum line and hose, and sends a measured sample of the exhaust gas backpressure and sends it via the hose to the bpt, which essentially is a switch, that when the exhaust gas backpressure is sufficient, it allows the vacuum (which the vacuum switch also controls) to activate the egr. it's just a way for the system to allow egr operation when it is advisable, if you will.

to find it, follow the vacuum-looking hose to it. it's possible btw, that the bpt is fine but that thin line at the egr that sends the exhaust gas to the transducer is clogged up, making him believe it is the bpt not responding when in fact the bpt isn't getting the stuff to respond to.

your egr is easy to remove and clean that port. if you read the FAQ#1 in the link at the top of the forum index page, it describes a different type of egr valve, but it talks about that line, although it is mis-identified as a vacuum line. you *might* be able to clean this out without removing the egr, using carb cleaner and a piece of wire or similar.

my egr, similar to yours, passed all the normal on-car tests for proper operation, including vacuum and bpt operation. when i removed the egr, it looked pretty good, but i found a tiny bit of exhaust build up in that line, hardly blocking anything. cleaned it out, and vehicle ran much better without any hesitatin at ~2500-3000 rpm steady that i had been experiencing.

i think i may have some photos if it really needed. you can also go to the isuzu online parts site and find full parts illustrations of every part on your vehicle, which can be a big help if you don't have any manuals. www.myisuzuparts.com

do you have any manuals?

//bc

[GEN XER]

Originally Posted by trooperbc

it's the egr backpressure transducer. it's part of the egr system. the egr valve has a port that looks like a vacuum line and hose, and sends a measured sample of the exhaust gas backpressure and sends it via the hose to the bpt, which essentially is a switch, that when the exhaust gas backpressure is sufficient, it allows the vacuum (which the vacuum switch also controls) to activate the egr. it's just a way for the system to allow egr operation when it is advisable, if you will.

to find it, follow the vacuum-looking hose to it. it's possible btw, that the bpt is fine but that thin line at the egr that sends the exhaust gas to the transducer is clogged up, making him believe it is the bpt not responding when in fact the bpt isn't getting the stuff to respond to.

your egr is easy to remove and clean that port. if you read the FAQ#1 in the link at the top of the forum index page, it describes a different type of egr valve, but it talks about that line, although it is mis-identified as a vacuum line. you *might* be able to clean this out without removing the egr, using carb cleaner and a piece of wire or similar.

my egr, similar to yours, passed all the normal on-car tests for proper operation, including vacuum and bpt operation. when i removed the egr, it looked pretty good, but i found a tiny bit of exhaust build up in that line, hardly blocking anything. cleaned it out, and vehicle ran much better without any hesitatin at ~2500-3000 rpm steady that i had been experiencing.

i think i may have some photos if it really needed. you can also go to the isuzu online parts site and find full parts illustrations of every part on your vehicle, which can be a big help if you don't have any manuals. www.myisuzuparts.com

do you have any manuals?

//bc

I dont have any manuals. This car has rarely given me any problems in the 14 years that I have had it. I really did not need any manuals. If you can find those pics please post them for me. I know where the EGR valve is and I'll clean it tomorrow along with the pipes connected to it.

Thanks.

[trooperbc]

Originally Posted by GEN XER

I dont have any manuals. This car has rarely given me any problems in the 14 years that I have had it. I really did not need any manuals.

yep, so now's the time to get the good factory service manuals if you want to do your own work and are going to keep it.
www.helminc.com

If you can find those pics please post them for me. I know where the EGR valve is and I'll clean it tomorrow along with the pipes connected to it.

Thanks.

this might be better from the isuzu online parts site i mentioned www.myisuzuparts.com

#1 is the egr of course. the little pipe/line i'm referring to is the one that comes out the bottom area of the egr valve and goes to the bottom of
the backpressure transducer #26.

the top line from the egr #675 is the vacuum line that supplies vacuum to the egr from the bpt which gets it from the vacuum switching valve which gets it from the manifold/common chamber.

anyway check that exhaust sampler port and clean it for sure.



//bc

[trooperbc]

btw, taking off that big long egr pipe that goes into the exhaust manifold can be nasty at the exhaust. i never did remove it since i didn't need to. it is easy to remove the connection for that pipe at the egr valve.

removing the egr is simple and *most* likely the gasket will remain intact and on so take care with it if you haven't gotten a replacement before hand.

[GEN XER]

I thought the EGR was #26 and the transducer was number 1. Is it really necessary to remove part #1 in the diagram if I use carb cleaner to clean it? I can take all the hoses off and shoot some carb cleaner in the valve and the pipe that runs to the manifold. What do you think? By the way after 230K miles I am going to sale my Rodeo, thats why Im trying to get the check engine light to stay off. Do I need to do anything to part #26 in the diagram?

[trooperbc]

Originally Posted by GEN XER

I thought the EGR was #26 and the transducer was number 1. Is it really necessary to remove part #1 in the diagram if I use carb cleaner to clean it? I can take all the hoses off and shoot some carb cleaner in the valve and the pipe that runs to the manifold. What do you think?

i think it would be ok. use a piece of thin wire to poke down that tube. it's all going to depend on how much is in the line. i would then run it, watch your eyes, so that the exhaust coming out that tube blows out the gunk and cleaner and so it won't make its way to the bpt. it's worth the try. there's no servicing the bpt.
and yes #1 is the egr valve. #26 is the backpressure transducer.

good luck

//bc

[GEN XER]

Thanks Tropper. I will tell you how it goes.

[GEN XER]

Cleaned the EGR and my check engine light stayed out for a while but eventually came back on. I think I should clean it again to see if i can get it to stay out. You should have seen all the whit smoke made by the carb cleaner in the exhaust manifold and cats.

[trooperbc]

Originally Posted by GEN XER

Cleaned the EGR and my check engine light stayed out for a while but eventually came back on. I think I should clean it again....

that would convince me to *remove* the egr and do it all. it's really easy.

//bc

[GEN XER]

Originally Posted by trooperbc

that would convince me to *remove* the egr and do it all. it's really easy.

//bc

Yeah I know

[rodeo157]

watch how much carb cleaner you get into the intake, it will kill the o2 sensore. might want to check it. if it stayed out a while the check engine light might be a bad o2 sensore now. i had this happen after cleaning the throttle body once.

[GEN XER]

I changed the tstat, toped of the coolant, fans work fine and the radiator has no leaks. It just keeps overheating. I checked the oil and its not going in there so I am at a loss.

[Ramblin Fever]

Did you use an OEM Isuzu thermostat - you can NOT use just any thermostat on these engines.

Also, how OLD is your radiator, if it's original, it's corrodid internally causing the issue.

Waterpump could be shot too, if it has 90k or more miles.

[GEN XER]

Originally Posted by Ramblin Fever

Did you use an OEM Isuzu thermostat - you can NOT use just any thermostat on these engines.

Yes

Also, how OLD is your radiator, if it's original, it's corrodid internally causing the issue.

Changed it out in 2001.

Waterpump could be shot too, if it has 90k or more miles.

Bingo still has the original pump in it. Ill get it changed out.