Pop on Startup
02-07-2004, 09:24 AM
#1
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Pop on Startup
About once or twice a month when I start my v4runner there is a quick loud pop that comes from the intake. It ussually happens after it has been sitting overnight, but not always. Any thoughts?
96' 4Runner 3.4L
Jeff
96' 4Runner 3.4L
Jeff
02-07-2004, 06:21 PM
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cubuff4runner i have the same problem, and people on this board said that it maight have a lot to do with teh deck-plate mod. i dont know if you have done this since you dont have it on your list.
jason
jason
02-07-2004, 08:35 PM
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that might be it ... heres my post from a while ago https://www.yotatech.com/forums/show...hlight=popping
Last edited by 3.4v6; 02-07-2004 at 08:37 PM.
02-07-2004, 09:16 PM
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It has nothing to do with the deck plate mod. Just forget about that.
The first thing I would look at is the lack of cold start enrichment inducing a lean back fire. Use a scan tool and interface with the ECU and look at what the engine coolant temp sensor is reporting for a temp and then fire it up and watch it as the engine warms up. If it reports fine and you have the proper fast idle that slowly goes down during warm up then I would look at the ignition system starting with the plugs.
Gadget
www.GadgetOnline.com
The first thing I would look at is the lack of cold start enrichment inducing a lean back fire. Use a scan tool and interface with the ECU and look at what the engine coolant temp sensor is reporting for a temp and then fire it up and watch it as the engine warms up. If it reports fine and you have the proper fast idle that slowly goes down during warm up then I would look at the ignition system starting with the plugs.
Gadget
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02-08-2004, 07:38 AM
#8
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I agree with Gadget that it is likely a sensor problem but without hooking it up and watching at startup it will be almost impossible to find the culprit. Check the plugs just to be sure all are good (no bent electrodes or excessively worn ones) before going through all the trouble to find the problem. Then hook it up and watch all the sensors carefully. If you need a good diagnostic reader, just look at the one in my signature.
Last edited by MTL_4runner; 02-08-2004 at 07:40 AM.
02-08-2004, 07:57 AM
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Until you know exactly what is wrong, it would be irresponsible for anyone to tell you not to worry about it.
Gadget
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Gadget
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02-08-2004, 08:54 AM
#12
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Originally posted by Gadget
Until you know exactly what is wrong, it would be irresponsible for anyone to tell you not to worry about it.
Gadget
www.GadgetOnline.com
Until you know exactly what is wrong, it would be irresponsible for anyone to tell you not to worry about it.
Gadget
www.GadgetOnline.com
If it were my truck I would find that "pop" unacceptable even if it rarely happened.
That is just me tho.
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