starting problem and rpm problem - Car Troubleshooting


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starting problem and rpm problem

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upmaine
User

Mar 9, 2010, 3:59 AM

Post #1 of 3 (2017 views)

starting problem and rpm problem	Sign In

Prior to this past weekend my 99 6cyl 4wd blazer always started right up on the first crank. But since this past weekend it takes alot longer to start now. It has to crank over several times before it starts up. Sometimes it will start right up but sometimes it cranks for a few seconds before it starts up. Any ideas as to what would cause this. Also I don't get any fault codes at all. When I turn the key part way I can hear the fuel pump charge the system so I decided to do this and then turn the key all the way and it still cranks over for several seconds before it starts. I had a complete tune up done 4 months ago and the blzer doesn't have to sit for a long time for it to do this. I can shut it down and start it right back up and it will crank for several seconds before it starts and once in a while it starts right up. before I turn the key all the way on I turn it part way and I can hear the fuel pump charge the system and then I turn the key all the way and it still takes a few seconds to start. Also I just came back from going to the store and I noticed that after I put it into gear and I start to go I can take my foot of the gas pedal and the blazer will continue to go and it will go up to 30mph all by itself and stay right there. the rpm will stay around 1000/1200 rpm and the only way I can make the rpm drop back down is if I come to a complete stop and hold the brake then I can see the rpm drop down to normal. Then once I start to go again and the tach goes above 1000 rpm's I can take my foot of the pedal and it will go by itself and stay around 1000/1200 rpm. I don't know if both problem are related or not but it seems strange that they both started at the same time and I would think that I would get a fault code but I don't get a check engine light and I also plugged in my tester and I get no fault codes.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Mar 9, 2010, 5:15 AM

Post #2 of 3 (2015 views)

Re: starting problem and rpm problem	Sign In

I'd check fuel pressure as most of these are fussy to be exactly within specs. The high idle may be just the system trying to cover a stall and secondary to the source trouble.

Check codes anyway - there may be info even without the light staying lit,

T

upmaine
User

Mar 10, 2010, 5:57 PM

Post #3 of 3 (2004 views)

Re: starting problem and rpm problem	Sign In

I plugged in my tester and there are no codes at all. Would a dirty fuel filter cause these problems. I put a brand new fuel pump in the blazer 7 months ago. So I hope it's not a problem with that. The engine runs great except for the the 2 problems i'm having with it now.

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