My 98 4.6 pings and i need to know how to do this throtle body cleaning. Can someone direct me to instructions? Pics would be of GREAT use as i need to get this done. Thanks!

 

it is prolly a combination of your throttle body AND your entire EGR system that need cleaning.

what ever you do don't use carb cleaner on your throttle body.

do a search on this site for the egr cleaning.

you might also want to replace your temp sensor. just trust me on this one.

good luck.

 

ok thanks
?- whats a temp sensor? where is it?

 

temp sensor is in your intake tract between the filter and the TB. It is the only set of wires going to you intake other than the wires for the MAF.

 

hcmq,
Why shouldn't you clean your throttle body with carb cleaner? I've heard this but never the reason why.

A TB cleaning story:
I had a 92 Sable where the check engine light was coming on everytime I exited off the expressway onto the exit ramp. The diagnostic codes were always pointing to the MAF. Tried everything...nothing worked. Finally, I realized that everytime I exited the expressway, the throttle plate was going from very much open to closed quickly (I would take my foot off the accelerator). I took off the snorkle tube and looked in the TB. Boy, it was dirty from the EGR system, especially around the throttle plate. The TB even had a sticker on it that said don't clean the TB. It didn't say why, just don't do it. Well, taking into consideration that this car had 125,000 miles on it and I didn't care too much about hurting something, I sprayed the heck out of the TB and the throttle plate with Gumout carb cleaner (this can of carb cleaner had to be at least 10 years old). Well, I cleared the engine codes and took it for a spin. VIOLA!!! Fixed!!! I never have gotten the check engine light to come back on and that was 4,000 miles ago.

So, again, why shouldn't you use carb cleaner on the TB?

 

the reason you are not supposed to use carb cleaner on the TB is that they have a factory plastic coating on them that the carb cleaner will remove. It is put there to make cleaning easier. In most cases you can push open the throttle plate and wipe it down with a rag.

carb cleaner is made for carbs not modern throttle plate systems. I to use carb cleaner on my 90 cavalier which is throttle body injected and I have had no problems. Newer TB's like on these trucks have the "Coating". By the way this Coating's thickness is taken into account in the idle program.

also on these newer modern engines- basically anything with a cat- you DO NOT want to run the engine while spraying the TB. You can cook your cat/s right quick!

Sorry for the misscommunication, I was talking about the coolant temp sensor not the air temp sensor.