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Some pull the egr off and install a 050" steel plate with a gasket on each side of the plate. Gaskets are about $12 or $13 a piece. Then reinstall the EGR. Leave all the electrical hooked up and just cap the vacuum line like we did. Really know way to know for sure if it is staying open or...

^ Yeah I am real curious to how dirty the upper and lower intake plenums will be. Cant wait for the weather to warm up so I can do this. Gasket is around $6 so it should be cheap to do. Not sure if I will plug the hole with a freeze plug or not.

^ If your truck is a OBD I then yes. Just tested the sensor again and now it is reading 6.34 at 20k. So the reading is 6340 ohms. This is about right. So I guessing new glow plugs. I am the third owner and the first two owners kept all their receipts. I went through them and no sign of...

^ It was 3.48 ohms with my meter set on 20k. This would be around 3480 ohms then. It's 32 degrees outside so I would imagine the water temp to be 32 degrees. From the table provided in the sticky I should see a reading of 9420 ohms.

I posted earlier that I thought my LP was going out. Test showed that it is working. I plan on doing the OPS mod soon. I am having hard start issues and was directed to test my ECT sensor. With the OHM meter I am getting a reading of 3.48 ohms. I would assume that the ECT is bad. I...

^ started truck and opened the T valve. Fuel came out but it sure looked like a lot water. It smells like diesel though. Truck was still hard to start. I am wondering if maybe some of the glow plugs might be bad. I need get my ohm meter out to test the ECT though and see what it shows. Now...

I have been reading how you are supposed to hear your lift pump running when you shut off your vehicles for a few seconds. Well I have been trying to hear mine after I shut it down and I finally heard it. Couple of questions: 1) can you hear it running while the truck is running? I cant...

Thanks. I will give the cleaning method a try. Another to add to the to-do-list.

Right before Christmas the SES light came on for about 2 miles on the highway then went off. Then just a few days ago my wife said it came on again for just a few miles and then went off. She was on the highway as well. Both times the wind was blowing 30 mph or more. A light drifting snow was...

Need a power window switch for the passenger side for a 94 yukon. Switch works to go down but not up. Driver side works fine to control passenger window. Autozone or O'reill'ys does not have it. Rockauto has it but no picture. Would like to be sure before ordering and would prefer local but...

This gave me the answer to the 3 I couldn't find. They relate to the tire size for the vehicle including the spare.

^ Thanks guys. I just finished the RPO codes and got all but 4 of them. One is scratched up to bad to decipher and the other 3 I cant find: Even tried to google the following 3: XGM, YGM and ZGM.

Is there a website or a link with what the codes mean? Or even a sticky? Thanks.

^ sticker on driver side door panel has tire size as 265/75/16. My 1994 fullsize chevy blazer (350 gas) that I sold had 265/75/16 which was shown on door panel as well.

JiFaire, current t stat is one from autozone. I know for sure it is a stant brand. I will purchasing a ACdelco from one of the online dealers that is a 195 stat to replace the current. It wasn't overheating before but the 195 stat that I replaced looked just like the stant one. I will never...

^ Thanks. I think I read the thread a thousand times before I felt comfortable about doing the mod. Then I saw the relay picture for LP on the firewall which is like my Yukon. So then I got confused again.

^ thanks.

^ Sorry but I use the CAI pretty loosely in terms when talking about this type of setup. Also I dont see how my tire size can effect fuel mileage that much. I know they are one size above stock but running a smaller tire would mean more RPMs when doing the the same speed. Of course running to...

Updated signature. Not sure what gears yet. I know with the 285/75/16 tires I am running right at 2000 RPMs at 65 mph. Photos below show my custom CAI and ground mod to stop the gauges from bouncing.

New here and this is my first post. I currently have a 1994 GMC Yukon that I recently picked up. I have searched and read many post about the OPS, LP and the relay mod. I am pretty sure how to begin this task but I do have a few questions. If you look at the 2nd picture you will see...