Guru's of the IAC, TPS, CPS, etc.....
#1
Guru's of the IAC, TPS, CPS, etc.....
OK fellas, I have searched and read a zillion threads about this, but found no "for sure" answers with my issue.
If my truck sits for a while (2-3 days typically), when I first start it it will instantly stall unless I have steady throttle pressure. It only seams to do this after sitting for a while, then after a minute or less its good to go for several days until it sits again.
From researching, it sounds like it could be possibly one of several of the sensors, none of which I know anything about. Any ideas for which one it might be? And how exactly do you "test" a sensor?
Any suggestions would be great. Its no real issue yet... all I have to do is keep my foot on the gas when I first start it. But, I know its not right and I don't want any further issues to occur. Thanks in advance for any recommendations fellas
If my truck sits for a while (2-3 days typically), when I first start it it will instantly stall unless I have steady throttle pressure. It only seams to do this after sitting for a while, then after a minute or less its good to go for several days until it sits again.
From researching, it sounds like it could be possibly one of several of the sensors, none of which I know anything about. Any ideas for which one it might be? And how exactly do you "test" a sensor?
Any suggestions would be great. Its no real issue yet... all I have to do is keep my foot on the gas when I first start it. But, I know its not right and I don't want any further issues to occur. Thanks in advance for any recommendations fellas
#4
#5
Fuel pressure. Hmmm, that never came up in any of my searching.
Yeah, fires right up like always on the first crank, but then instantly dies. Then it wont do it for again until it sits for a while, even if its a week or two later.
That would explain why it only does it after a long sitting (as apposed to a sensor which would most likely do it all the time, correct?).
Also, I disconnected the main fuel line last time I did the plenum, timing chain and water pump. Maybe it didn't get a good seal when I reinstalled it?
Guess I will have to check up on the fuel pressure deal, problem is I don't know how. Any quick how-to's?
And thanks for the quick reply's guy's!
Yeah, fires right up like always on the first crank, but then instantly dies. Then it wont do it for again until it sits for a while, even if its a week or two later.
That would explain why it only does it after a long sitting (as apposed to a sensor which would most likely do it all the time, correct?).
Also, I disconnected the main fuel line last time I did the plenum, timing chain and water pump. Maybe it didn't get a good seal when I reinstalled it?
Guess I will have to check up on the fuel pressure deal, problem is I don't know how. Any quick how-to's?
And thanks for the quick reply's guy's!
#6
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#8
There is a valve on the fuel rail called a schraeder valve. It looks just like a short valve stem for your tires. You need a fuel injection pressure tester, which is available at any parts store for a reasonable price. You follow the installation instruction that come with the tester which is usually to screw it onto the schraeder valve. then start the truck and watch the gauge on the tester. It should be at about 50lbs. at idle and then take your handle and move the throttle and watch the gauge. It should increase steadily with the throttle indicating that the pressure regulator is good as well. that is about as short as I can make it for you. Hope this helps. You should also look into cleaning the IAC orifice and the IAC itself, if not even replace the IAC if it doesn't pass the test with a multimeter.
#9
Oh yeah, the battery. Suppose I will check that too while I'm messing around. It was brand new lass than a few years back, but I suppose that does not mean a thing. I replaced the factory battery after over 8 years of use, and the dang thing was still working great... I just figured it would be good maintenance. It would make sense the new one would be weak already
Thanks on all the quick replies fellas. I will start investigating today after work and let you guys know what I find out.
Thanks on all the quick replies fellas. I will start investigating today after work and let you guys know what I find out.