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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / December 2004Need to leave key "on" for a few seconds before car will start & run properly
Our '95 Maxima, 151k miles, just developed a startup problem. When you start it for the first time in the morning it won't idle at first--needs gas for a few seconds (5-10), or it dies. Runs great after that. We tried leaving the key in the "on" position for a few seconds before starting, in case it would build up fuel pressure. Sure enough, it started fine that way. I'd imagine either the pressure shouldn't bleed off overnight, or it should build up much faster. If the former, a fuel injector seems a likely culprit, if the latter, the fuel pump. Think it's one of those? Something else? Fuel filter was replaced 15k miles ago. Since this car has 6 fuel injectors (all original), and 3 of them aren't the easiest to get to, I'm not anxious to have to replace 'em. Are there any fuel-injector cleaners that are likely to help? Or maybe my local garage's engine-vac service? If it were a fuel-pump problem, would the car have any problems running, for example at WOT? > Our '95 Maxima, 151k miles, just developed a startup problem. When > you start it for the first time in the morning it won't idle at [quoted text clipped - 17 lines] > If it were a fuel-pump problem, would the car have any problems > running, for example at WOT? Sounds like the check valve...but it may be located within the pump.  SignatureAnthony You can't 'idiot proof' anything....every time you try, they just make better idiots. Remove sp to reply via email > Sounds like the check valve...but it may be located within the pump. Make sense. Thanks! I'm sure my garage would be able to confirm & repair. Didn't want to go there if injectors were likely, since the difference between DIY and garage replacement is $1000 or more. > > Sounds like the check valve...but it may be located within the pump. > Make sense. Thanks! I'm sure my garage would be able to confirm & repair. > Didn't want to go there if injectors were likely, since the difference > between DIY and garage replacement is $1000 or more. I've seen several fuel pressure regulators stuck open. I've hardly see fuel pump check valve fail, but that is most likely untrue. Now... take for instance, you pinch the fuel return line, stop the engine and wake up next morning and try to start normally. If it starts then the pressure is holding overnight. >> > Sounds like the check valve...but it may be located within the pump. > [quoted text clipped - 7 lines] >stop the engine and wake up next morning and try to start >normally. If it starts then the pressure is holding overnight. I had a problem on my 97 Ranger where I had to turn the key forward and wait for the check engine light before it would start. It turned out to be the PCM relay. Tom Seattle >Our '95 Maxima, 151k miles, just developed a startup problem. When you start >it for the first time in the morning it won't idle at first--needs gas for a few seconds [quoted text clipped - 11 lines] >Are there any fuel-injector cleaners that are likely to help? Or maybe my >local garage's engine-vac service? You can always try a can BG-44K (you can usually get from a Toyota dealer and others probably sell it). It is pretty strong stuff, but would help to eliminate things. - -- cnewton.remove-this@akaMail.com Anti-Spam filter in place-- <delete .remove-this to respond to email> Does the 95 Max have a fast idle cam? Sounds like that might not be opening the throttle when the engine is cold and that's why you have to hold it open yourself.. Just a guess.... > Our '95 Maxima, 151k miles, just developed a startup problem. When you start > it for the first time in the morning it won't idle at first--needs gas for a few seconds [quoted text clipped - 14 lines] > If it were a fuel-pump problem, would the car have any problems running, > for example at WOT? > Does the 95 Max have a fast idle cam? Ye gods. Fast idle cams disappeared DECADES ago. Even most of the last carburetors in the late 1980s didn't have them, having substituted throttle kickers instead. No, the 1995 Maxima does not have a fast idle cam. Well, maybe my terminology isn't quite right, but my 99 Altima does have a wax controlled cylinder that actuates a cam which opens the throttle when cold.. Kinda suprised me since my 94 does not have anything like this.. I always figured the ECU kept the revs where it wanted them with the idle control valve... > > Does the 95 Max have a fast idle cam? > [quoted text clipped - 3 lines] > > No, the 1995 Maxima does not have a fast idle cam. > Ye gods. Fast idle cams disappeared DECADES ago. Even > most of the last carburetors in the late 1980s didn't > have them, having substituted throttle kickers instead. What's the difference between a fast idle cam and a throttle kicker? Is a throttle kicker usually a vacuuum operated device, like the throttle positioner found on some 1980s Toyotas (opened throttle to maintain idle speed when A/C was turned on)? > We tried leaving the key in the "on" position for a few seconds before starting, > in case it would build up fuel pressure. Sure enough, it started fine that way. The problem has gone away by itself. Thanks everybody for the suggestions! David |
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