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I have a 2000(00-06) tahoe 5.3l witch has the following

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Hey, i have a 2000(00-06)...
Hey, i have a 2000(00-06) tahoe 5.3l witch has the following symptoms:Multiple misfire code p0300
Misfires currently on syl 1,3,4. Did misfire only on 4 and 7 a while ago but now 7 is ok but 3 and 4 is misfiring. Will only misfire when idling, Fine when driving.Voltage fluctuation and cluster/door lights flickering with it and now suddenly cluster light is gone only to come one sometimes when the turn signal is activated. The cluster is then blinking with the flasher.I have new original sparkplugs, two new coil that i have switched around and it didn't change anything. Also new sparkplug wires.All of these problems(exept cluster blinking) has started more or less together a year ago and has slowly gotten worse.Best regards ***** grytdalNorway
Submitted: 4 months ago.Category: Car
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Answered in 17 minutes by:
12/15/2017
Auto Mechanic: Gabriel Grey, Auto Service Technician replied 4 months ago
Gabriel Grey
Gabriel Grey, Auto Service Technician
Category: Car
Satisfied Customers: 437
Experience: Master Service Technician
Verified

Hello Jan, I hope you are doing great today. My name is***** am a Chevy technician and I would be happy to assist you with this.

Since the misfires are changing cylinders that makes me think it may be a sensor issue. If there becomes a problem between the Camshaft/Crankshaft sensors it will start to develop random misfires and minor timing issues. Does the vehicle have trouble codes stored for anything other than misfires?

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Customer reply replied 4 months ago
I checked now an got a: P0132 o2 sensor circut high voltage bank 1 sensor 1. My diagnosis scanner shows O2B1 S1 at 1.105v and SHRTFTB1 S1 0.0%. Is this related?
Auto Mechanic: Gabriel Grey, Auto Service Technician replied 4 months ago

The short term fuel reading sounds normal, is the O2 reading staying consistently at 1.105v or is it fluctuating at all while the engine is running?

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Customer reply replied 4 months ago
i saw only 1.105v but the short term was at one point -35.2%
Auto Mechanic: Gabriel Grey, Auto Service Technician replied 4 months ago

Okay interesting. Have you replaced the fuel filter on this yet?

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Customer reply replied 4 months ago
I am pretty sure i they changed the fuel filter. I forgot to mention that this car also runs on lpg and it isn't any change when switching from gas to lpg or lpg to gas. And they have separate fuel filters i belive. Or does it have extra fuel filters conected to each bank?
Auto Mechanic: Gabriel Grey, Auto Service Technician replied 4 months ago
Okay I see, I do not have much experience will lpg set ups so I am going to opt out and open this up to a new expert
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Customer reply replied 4 months ago
ok.
Auto Mechanic: Tim's Auto Repair, Mechanic replied 4 months ago
Tim's Auto Repair
Category: Car
Satisfied Customers: 16,228
Experience: Have owned a repair shop for 25 yrs.
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Hi, My name is ***** ***** for the delay.

I will do my best to assist you.

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Auto Mechanic: Tim's Auto Repair, Mechanic replied 4 months ago

from the way you explain,i think you have more than one problem,,

1-i think your dashlights are acting up because you have a bad multi-function [sgnallight] switch..these will burn out and do this.

2-as for the multi-misfire..i would think you may have a bad crank sensor sense the miss-fire is moving around to different cylenders..i have seen bad intake manifold gaskets do this,,but i think it is the crank sensor

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Auto Mechanic: Tim's Auto Repair, Mechanic replied 4 months ago

If you are satisfied with my answer, Please Rate my answer by clicking the rating button so I can get credit for my work. I’m not always going to be giving you good news, so please don't let this stand in the way of you accepting my answer. .it does not cost you more money and we will still be able to communicate, ,.please understand, i can not see, hear or touch the vehicle and only know what you tell me. Bonuses and positive feedback are appreciated.. if you are not satisfied with my answer, please do not leave bad feedback ,i will gladly opt out and let another expert handle the question. .if i have sent any diagrams, please print them. .sometimes you may need to right click the image [,then save picture as]to save it to your computer so you can open it with your picture program...Please ask if you need more help.

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