Sorry about the mis-information. I just swear when I read my Haynes last time that was proper procedure on testing the function of the iac besides all the back probing with a volt meter. I've done it myself also and it moved slower then a turtle lol

 

While the hissing sound is notorious for the IAC valve problem, it could also be a horrendous vacuum leak, a cam timing problem or a clogged cat. start simple n work your way up. 1)If it's the IAC, you can leave it unplugged and start the pick up and see if the problem goes away. 2)If there's a bad vacuum leak, this can confuse the ECM because it only knows to look for air coming in where the mad scientist who designed it told it to look. 3)If the timing chain is stretched bad enough or jumped time, the cam lobes open and close the valves at the rong time giving off a weird chugging noise from the throttle body. 4)If the cat's clogging/clogged, think constipation...does your exhaust sound deep n throaty when "vrooming" or weak n asthmatic. Pulling the upstream O2 sensor n starting the pick up will help determine this possibility. And under the heading of last but certainly not least...is the check engine light on?

 

From Haynes, along with there picture of doing the procedure.

 

Not my experience. On mine, the PCM pushed the pintle OUT, until it shot off into the yard, and was forever lost.......

 

Hahahah! Kinda funny but dang that sucks. That could've been your sign of your very own bad iac lol I know last time I took one apart, it has threads on the bar for the pintle with the spring under it.. yours had probably been so worn it did that. Still,, pretty funny lol

 

I am sure the look on my face was quite amusing. Unfortunately, it was a 'new' IAC I was testing from another truck. (P0505 code.....)

 

Hah probably priceless. Let's just be thankfull there not bigger pintles and rod, your lawn mower may have found it for you !

 

My mower is fairly billy bad-****. It could probably much up a small car without too much effort.

 

Thats gnarly !! 🙈
Does it too have a Dodge v8? Haha fully built for... Street anddddd grass!

 

Well..... now that you mention it..... I DO have another 360 hangin' on the engine stand in the garage, the the little four cylinder that's in the tractor is getting a bit tired...... Wonder if I could adapt the governor to limit RPM on the 360.

Although, while mowing the grass may be a LOT more fun....... payin' for the gas it consumed at 3250 RPM wouldn't be.......