97 460 starting problems
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97 460 starting problems
I have a 97 460 in my class A motorhome. It has 50000 miles on it with a banks intake and exhaust systems installed. I have had it almost a year and it has always run great and started right up. In my pre-trip run up/inspection/clean up duties I noticed it started hard, meaning it took maybe three tries to start. After cleaning the exterior of the motorhome it took at least 10 tries to start. Now it will take even more times and after it starts I turn it off and start it again several times its not smooth but it starts. Then it will not start at all. No consistency in starting at all.
I have feul pressure and can hear the pump start. I have cleaned the idle solenoid valve (name ?) it had a small amount of carbon but nothing bad. I have looked at the vacuum lines and they appear to be fine. I did find a red vacuum line not connected to anything. I thought it was an electrical line because it has been there for months sucking unfiltered air into the intake. I could not find where this line goes so I capped it off. It had no effect of the engine starting.
I will do a fuel pressure check this morning and research that red vacuum line some more.
Anybody have any ideas on the starting besides the red vacuum line? I think that line has been off for months and the coach has started right up every time and ran pretty well.
Thanks for the help
I have feul pressure and can hear the pump start. I have cleaned the idle solenoid valve (name ?) it had a small amount of carbon but nothing bad. I have looked at the vacuum lines and they appear to be fine. I did find a red vacuum line not connected to anything. I thought it was an electrical line because it has been there for months sucking unfiltered air into the intake. I could not find where this line goes so I capped it off. It had no effect of the engine starting.
I will do a fuel pressure check this morning and research that red vacuum line some more.
Anybody have any ideas on the starting besides the red vacuum line? I think that line has been off for months and the coach has started right up every time and ran pretty well.
Thanks for the help
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Joined: Nov 2006
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kind of sounds like what was going on with mine, sounds like bad compression...radiator leak..? But deffinately sounds like bad compression, thats what mine had been doing, hard starts, but not nearly as bad as that, mine would always start, but harder after she was already warm...
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Joined: Mar 2006
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From: fargo, nd
when it turns over, does it turn over fast or slow? if it turns over really fast then it could be low compression, if it turns over slow it could be the brushes in the starter going to crap. the part you cleaned is the idle air control valve. if i had to guess though id say it sounds like you got water in your ignition system because you said youd just cleaned the exterior before you had problems... when you do get it running does the check engine light come on? if so just go pick up a scan tool- you can pick one up pretty cheap (around 50 dollars) at any tool store or cheap auto parts store. if the check engine light does come on my guess would be the knock sensor or something else screwing with the timing... mass air sensor may have gone to crap too... any number of sensors could have gotten wet and shorted out. wait a week for it to thoroughly dry out, then see what changes if anything, then take it from there
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I did not clean the engine just the outside of the motorhome. i also charged the battery overnight and got in this morning and it fired right up. did this several times and it got harder and harder to start but did start.
this motor turns runs over great so I dont think it the starter. I will do a compression check later. I have checked the fuel pressure and its good between 30 and 35. I could not find where this extra vaccum line goes though. it remains capped off.
as of now I can not get the motor to duplicate what it was doing last night. it starts every time, i'm letting it cool down right know then will try it again.
thanks for the input guys. I will let you know how it goes as the day wears on. suppose to leave on a MX riding trip at 5pm and fingers are crossed
thanks again
check engine light works and does not come on when running
this motor turns runs over great so I dont think it the starter. I will do a compression check later. I have checked the fuel pressure and its good between 30 and 35. I could not find where this extra vaccum line goes though. it remains capped off.
as of now I can not get the motor to duplicate what it was doing last night. it starts every time, i'm letting it cool down right know then will try it again.
thanks for the input guys. I will let you know how it goes as the day wears on. suppose to leave on a MX riding trip at 5pm and fingers are crossed
thanks again
check engine light works and does not come on when running
Last edited by garyvik; Feb 16, 2007 at 10:50 AM. Reason: missed a question
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