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Post by 34oldsdude on Apr 6, 2016 16:02:52 GMT -6
our recently purchased 99 sometimes makes a little backfire type of pop when starting I'm sure some out there has an idea, thanks for your help! Dave
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RCA1186
Administrator 
Rob
Go Pack Go!
Posts: 4,837 
Staff Member
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Post by RCA1186 on Apr 7, 2016 6:46:00 GMT -6
This pop is coming from the engine I assume. Does it do it every time you start it?
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bobsblue95
Super Moderator 
Scars of pleasure, scars of pain. Atmospheric changes make you sensitive again.
Posts: 3,125
Staff Member
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Post by bobsblue95 on Apr 12, 2016 14:09:44 GMT -6
random thought: could be a leaky injector loading up a cylinder with gas while engine is off
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blu52
Aurora Newbie
Posts: 13
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Post by blu52 on May 6, 2016 17:25:27 GMT -6
Hi, just as a side note, my 1995 1st gen (198,000) miles does the same thing. Not every time, a single pop and only once in awhile. With mine, if the engine has been running and warmed up, if I shut it off and try to restart too quickly it will backfire and make a little muffled pop. I surmise that since these are pretty high compression engines any fuel leftover in a cylinder needs very little to make it 'diesel' or ignite on its' own. If the previous owner did allot of stop and go driving there may be some excess carbon in the cylinder or on the top of the piston. I find an "Italian tune up" helps mitigate this problem for me. These engines were developed for hard use and if you don't put your foot in it every now and then they tend to carbon up. It seems counter intuitive to 'abuse' an engine but these are a very different breed of car. . . one reason why they are often misunderstood. Other places to look if the popping gets worse or just really bothers you would be fuel metering and or ecu problems. Oh, and don't touch the gas pedal just turn the key and wait for her to catch. It might be worth stopping by Autozone and have them check for codes. Just a thought.  |
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Post by sempar on May 6, 2016 17:51:58 GMT -6
Aren't these engines wasted spark ignition? If so, then the occasional " pop " through the intake is entirely normal.
John
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gottahavesum
Aurora Newbie
having issues with cooling fans
Posts: 3
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Post by gottahavesum on Oct 8, 2017 21:14:59 GMT -6
My 99 did the same thing for years, then once the fuel pump died i replaced it and the early morning pop was gone. i googled it and this happens when the pump is weak and you get a lean condition and dreaded pop. change your filter and pump and i'm sure your issue will be solved. Attachments:
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Post by lanceslambos on Oct 9, 2017 7:32:26 GMT -6
Aren't these engines wasted spark ignition? If so, then the occasional " pop " through the intake is entirely normal. John Yes, Auroras have the GM DIS waste spark ignition. Oddly, I've never heard of this issue before. I like bobsblue95 guess - and would further add that maybe the FPR needs adjustment. The torkx screw /allen wrench nut in the center of the FPR is an adjustment. Try marking or scribe a line on the screw head so you'll know where it was originally, then clockwise & counter-clock that screw and see if it helps. They are a cheap part to replace in the worst case. I'll second the "Italian Tune" (great description!) Grandpa driving starves the exhaust cams of lube. They only get a back splash of oil under normal throttle. It is highly recommended to frog your Aurora every chance you get! |
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