Terrible gas mileage!!
This is a discussion on Terrible gas mileage!! within the V6 forums, part of the Vehicle Specific category; Originally Posted by Smittro Right! Both are indications of a faulty 02 sensor.. Which currently according to the OP are ...
12-08-2011, 09:03 PM #21
i know we could debate about this for years but it really doenst matter till he replaces the sensor and sees what happens...
12-08-2011, 09:17 PM #22
Well lets look @ it in this light..
Black smoke is an indication of a rich condition.
Knock is a good indication of a lean condition.
If the 02 sensor in bank 1 where maintaining the proper AFR's above a lean condition then we can assume there would be no knock code.
Since knock generally happens under a load it's safe to say the bank 1 o2 sensor is causing lean combustion under a load in turn causing the knock issue..
This is why I stated it's likely to be the o2 sensor, not to mention it's way passed over due for changing them @ 80-90k iirc..
Further more since the o2 is dirrectly into the exhaust stream it's likely to go bad before the knock sensor which only sees block wall temps..
I understand what you're saying about the heater curcuit and I agree..
However this is pointing to a bad o2 all together. IMHO
Last edited by Smittro; 12-08-2011 at 09:25 PM.
12-09-2011, 02:37 AM #23
idk i just want to see what it is...
i mean we all know the o2 sensor needs to be replaced. but a knock sensor would also cause poor gas mileage.... lol
12-09-2011, 05:34 AM #24
Ya, all bebating aside you're right we'll just have to see how it goes..
12-09-2011, 09:05 AM #25
Lol don't debate till I update. I do appreciate both of you, I can promise you I will let yall know what happens after the replacment.
12-19-2011, 03:33 PM #26
Okay o2 sensor has been replaced! Mpg has gone from about 9mpg to 15 mpg city. But I still have a knock sensor code..and now all of a sudden a random miss fire code.. Just my luck huh? Codes poppin everywhere. I had these codes checked and diagnosed.
This v6 enigne is from my old 98 firebird tht I wrecked. I swaped this motor and tranny into my new 99 firebird. But I didnt swap the computer. So the mech. said these codes could be from the computer.
12-19-2011, 07:30 PM #27
shouldnt the 98-99 computers be exactly the same because they are exactly the same engines? so i cant see the computer causing this issue!
12-19-2011, 07:58 PM #28
Idk... in 99 the throttel body was changed to electric instead of a cabel and the engine in 1998 was a Series 1. In 99 it changed to a Series 2 Motor.
12-19-2011, 08:09 PM #29
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12-19-2011, 08:16 PM #30
Ok ill check the coil pack 2moro. How many volts do you think it should be when I test it?
12-19-2011, 08:31 PM #31
You'll be looking for a weak (yellow) spark @ idle and try switching the to wires @ the same coil.
Both plugs get fired @ the same time so if the misfire moves then one side of the coil is bad.
Coils are about $26 bucks each if that ends up being the case.
You can also try pulling each coil and checking that the ignition module coil pins are clean and not corroded.
Since the coil contacts are internal on the coil itself there's no way to check the voltage @ the coil.
12-19-2011, 08:38 PM #32
The cause of mine was water/rain and windshield washer fluid was able to bypass my hood seal and drip onto my middle coil.
This caused the coil to fry in my case which resulted in an intermittent misfire code..
here's where the leak was on mine..
12-19-2011, 09:13 PM #33
I have an extra set of coil packs from my 98 firebird that I parted out when I totalled it. Could I just use those to replce 2/5?
12-20-2011, 02:36 AM #34
12-20-2011, 03:51 AM #35
12-20-2011, 05:40 AM #36
12-20-2011, 07:57 AM #37
Thanks guys, ill update after I replace coils. Which will prolly be 2moro since I have school.and work today.
12-20-2011, 09:26 AM #38
Smittro, is this the yellow posts in the coils you were telling me about?
12-20-2011, 09:36 AM #39
I pored water on my windsheild and water pored all over the coils, there is a hole somewhere. Coil posts 2,5,1,4 are all yellow. 3,6 are silver and look fine
12-20-2011, 10:05 AM #40
They should be identical.
There are 2 pins under the coil itself that get corroded and can cause all sorts of issues..
The coil is held to the ignition module by 2- 5mm flanged bolts that also serve as coil grounds.
One bolt is in front of the coil between the spark plug wire posts and the other is on the oposite side.
Once the bolts are removed the coil will lift right out and expose the power pins from the ignition module.
Try to clean them up with a small wire brush or a chunk of sand paper prior to installing the other coil.
Just don't He-man them as if they snap off you'll have to replace the module too..
Also check the module bridge plug for corrosion as well, it's a pain but worth the time to ensure good contacts and spark.
They should all look the same.
Don't forget to use a little dab of anti arc compound when you get to where you're going to snap the wires back on..
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