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Post #1
 29th December 2008 - 06:05 AM
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Sup. So anyway, my sister's N15 GA16 Pulsar has been playing up a bit of late. When idling, the revs fluctuate by about 100rpm every few seconds. Each time the RPM's change, ALL the lights in the car dim momentarily. I mean ALL lights, interior, instrument cluster, headlights, everything. The fluctuations in the RPM don't occur at random times either, there's about 3 seconds between each change, which last for about a second each. I was thinking possibly alternator, but my opinion is far from a professional one. Will be taking it to a mechanic soon, just getting some thoughts. Edit: Forgot to mention, the fluctuating RPMs only happen at idle, but I think my sister said the lights are dimming briefly in those intervals while driving too. Thanks in advance, Luke. This post has been edited by Luke: Dec 29 2008, 06:07 AM -------------------- Need a part number? Ask here or send me a PM. Luke |
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dwvr
Post #3
alternator seems correct for the lights,but i dont know why that would affect the RPM unless the belt was too loose/too tight. |
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iamhappy46
Post #4
Idle Air Control motor |
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Luke
Post #5
QUOTE(iamhappy46 @ Dec 30 2008, 01:52 PM) [snapback]1283355194[/snapback] Idle Air Control motor  It cannot control air flow due to being gummed up with carbon deposits.The lights dimming is the alternator load sensor trying to compensate for the fluctuating rpm. However, if the battery is more than 2 years old, I would be looking at that first. The battery should have the current to maintain consistent power at idle Thanks. Battery was changed not long ago. Not 100% as to when, but within the last 12 months. Not saying I'm going to attempt it myself, but how would you clean the carbon deposits off the idle air control motor? |
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the_random_hero
Post #6
QUOTE(Luke @ Dec 30 2008, 08:29 PM) [snapback]1283357211[/snapback] Thanks. Battery was changed not long ago. Not 100% as to when, but within the last 12 months. Not saying I'm going to attempt it myself, but how would you clean the carbon deposits off the idle air control motor? Carby cleaner, and lots of it. Worked a treat on my car. |
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the_random_hero
Post #10
QUOTE(Luke @ Jan 4 2009, 08:13 AM) [snapback]1283374452[/snapback] Someone explain.. Just pop off the intake pipe closest to the air flow motor, and spray the carby cleaner down there or what? Don't really want to take the whole unit out and clean it.. Taking it out is the best way to clean it, makes sure that the carby cleaner doesn't totally miss what it's aiming for. It couldn't be too much work, mine was literally one bolt and it popped right out. |
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iamhappy46
Post #11
Needs to be removed. The Idle Air Control Valve will CLOSE as you try to keep the rpm high enough to get it into the alve. You also need the pressure from the spray pack to clean it as most of the gunk is inside the valve and has nowhere to go, so once the carby cleaner dries up, the gunk is still in there. |
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Luke
Post #12
QUOTE(iamhappy46 @ Jan 4 2009, 11:59 AM) [snapback]1283374916[/snapback] Needs to be removed. The Idle Air Control Valve will CLOSE as you try to keep the rpm high enough to get it into the alve. You also need the pressure from the spray pack to clean it as most of the gunk is inside the valve and has nowhere to go, so once the carby cleaner dries up, the gunk is still in there. 2 wiring plugs and 3 bolts from memory. I'll take a closer look at the engine when I can, I just took a quick look the other day and saw what I assumed was the idle motor. It had a few breather pipes from the rocker cover going into it as well.. |
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