need some suggestion on poor acceleration performance - Page 3 - Kia Forum
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post #21 of 29 (permalink) Old 12-23-2016, 10:52 PM Thread Starter
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I did not use the NGK plugs. I was being cheap and use the autolite platinum plugs.

Today, I got some time to do some experiments with the car. I sprayed the MAF sensor again. Sprayed and wiped the throttle body. Also, I sprayed water into the throttle body while the car running at 2K rpm. Yes, I was trying to decarbonize the engine using water. I sprayed quite a bit of water and see lot of steam coming out of the exhaust pipe. But I did not see any carbon soot like what I saw on youtube.

I drove the car tonight for a short while. I could well be biased but I think the car is doing better. It seems to have less hesitation. At the moment, I can't be sure because the car is acting intermittently. I will know it better after the weekend. I hope I gain some power and MPG back.

Thank you for all of you giving me suggestions. I am not out of the wood yet. But I wish you all Merry X'mas !!

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post #22 of 29 (permalink) Old 12-27-2016, 09:22 PM
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So how did it all go?

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post #23 of 29 (permalink) Old 12-29-2016, 03:58 PM Thread Starter
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Really no improvement noticed after driving a couple more days. Other than one afternoon, I got a new error code after filling up the tank. Code P0447. It had only popped up once and never seen again No more knock code, misfire or MAF code. As long as I warm up a couple of minutes before driving off in the morning.
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post #24 of 29 (permalink) Old 12-30-2016, 07:18 PM
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I wonder if your fuel pressure is in spec.

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post #25 of 29 (permalink) Old 01-09-2017, 05:01 PM Thread Starter
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If the fuel pressure is problem, would I be having issue on freeway ? So far, I can hit 70 on freeway @ 3000+ RPM. Will that elminate the fuel pressure ?

Anyway, I have just gotten a new BT scanner and a laser thermometer. I intend to check on the CAT and datalog oxygen sensor. So far, I have not seen any error code but I want to explore the possibility of clogging CAT and other sensor problems. But right now, I am just too tied up at work. I will update you guys later.

Thanks
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post #26 of 29 (permalink) Old 01-09-2017, 10:01 PM
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You would hit highway speeds but there would be a noticeable sputter or miss fire at that demand. I had a couple Polaris RZR run like crap with 5psi under spec. It took me a bit to diag and with the ones I did it was not the only issue it only directed me to the next. If the PSI is low it can run lean then well that burns out the cat and then a O2 etc if it was not corrected early enough.

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post #27 of 29 (permalink) Old 01-09-2017, 10:23 PM
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If you have a friend who has or can do a fuel pressure test also do a compression test of the engine. A fuel PSI should be done off primed, idle and at a specified RPM.

A compression test across all 4 cylinders a 10-15% diff from lowest to highest is bad anything less is normal. Do each cylinder at least 3 times hold the throttle wide open. Make sure your battery is fully charged for this test and the starter load will drain it. DO NOT CRANK TOO LONG let it crank and once the needle stops moving stop. You should not have to crank past 10 seconds. If it is low and goes up and up but slowley fuel could be going in and making a seal. If one cylinder is low add some oil if it goes up its rings and well a rebuild.

A leak down would be next if compression is low this will tell you where its low rings valves which cylinder. Anything less than 10% is ok 11% and more bad some may argue 15% and less is ok. You will need shop air supply at 100psi. this test is more indepth as each cylinder has to be at top dead center compression.

These three tests might be better to have a shop do them as they have the tools to do this quickly. I would expect 2 hours of labor to do the work. That is cheaper than my compression tester and leak down tester combined.

Autozone rents the following. You pay a deposit so it is free to use and the two easiest tests you can do aside from lazing your cat and connecting a daig tool. Unfortunately not all autozones participate so check also advanced and i think orilies dose it to.

http://www.autozone.com/loan-a-tools...diagnostic-kit

http://www.autozone.com/loan-a-tools...n-tester-gauge

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post #28 of 29 (permalink) Old 01-09-2017, 10:29 PM
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Just for reference on the cost of my tools, Im sure snapon is much more.

CYLINDER LEAKAGE TESTER CLT2APB | Matco Tools

DELUXE COMPRESSION TESTER KIT CT166AK | Matco Tools

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post #29 of 29 (permalink) Old 01-10-2017, 09:19 PM
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One final note remove all spark plugs before doing the compression test. Bad things will happen to your tools if you dont and your readings will be off.

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