IAC valve

[duckle1]

Does anybody know how to test the idle air control valve to see if it is working properly?

[mudseeker]

it's easy with a scan tool, but since most people can not afford the luxery of one of those, i will have to look up the hard way when i get off work tonight.

shoot me a Private Message around 11pm if no one else chimes in with the answer.

[crabtruck]

With it unplugged, you could check to see that each of the two coils
has about 40-80 ohms (A to B and C to D)
What makes you suspect the IAC ? Something like high idle could be
caused by a dirty crankcase valve or other easy stuff.
Which engine is this ?
Maybe this link is helpful:
http://www.autozone.com/servlet/UiBr...3d8018b998.jsp

[436'd skylark]

Originally Posted by duckle1

Does anybody know how to test the idle air control valve to see if it is working properly?

year make model?

all sorts of IAC valves have rolled off the lines.

[duckle1]

this is a 4.8 v8 fuel injection, 365,000 miles, the iac valve is just one of the things im investigating to figure out my idle problem,

[duckle1]

Originally Posted by crabtruck

With it unplugged, you could check to see that each of the two coils
has about 40-80 ohms (A to B and C to D)
What makes you suspect the IAC ? Something like high idle could be
caused by a dirty crankcase valve or other easy stuff.
Which engine is this ?
Maybe this link is helpful:
http://www.autozone.com/servlet/UiBr...3d8018b998.jsp

thanks for the link...my truck will not communicate with a scanner,and I have dumped too much money in it as it is which is why im wondering if I can pull the egr valve off clean it and put it back on? I have replaced the tps,coolant temp sensor,put plugs wires ,changed the fuel filter,

[duckle1]

Originally Posted by mudseeker

it's easy with a scan tool, but since most people can not afford the luxery of one of those, i will have to look up the hard way when i get off work tonight.

shoot me a Private Message around 11pm if no one else chimes in with the answer.

even if autozone scans for free my truck will not communicate for some reason, so I have to guess. it Idles up and down in the mornings ,warms up and is fine, any ideas?

[duckle1]

Originally Posted by duckle1

thanks for the link...my truck will not communicate with a scanner,and I have dumped too much money in it as it is which is why im wondering if I can pull the egr valve off clean it and put it back on? I have replaced the tps,coolant temp sensor,put plugs wires ,changed the fuel filter,

I,m thinking EGR valve But its 150.00 Im tired of putting $ into this truck Any Ideas?

[duckle1]

Originally Posted by crabtruck

With it unplugged, you could check to see that each of the two coils
has about 40-80 ohms (A to B and C to D)
What makes you suspect the IAC ? Something like high idle could be
caused by a dirty crankcase valve or other easy stuff.
Which engine is this ?
Maybe this link is helpful:
http://www.autozone.com/servlet/UiBr...3d8018b998.jsp

4.8 vortec

[keithr0005005]

crazy idle could also be the tps