need some suggestion on poor acceleration performance - Kia Forum
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post #1 of 29 (permalink) Old 12-09-2016, 08:07 PM Thread Starter
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need some suggestion on poor acceleration performance

Recently, I have some issue with the 05 Rio I got. I used to be getting 35mpg combine. But lately, it has been down to 31 or so. I got two check Engine errors recently. The first one was the Mass Airflow sensor. I thought I got rid of the Mass Airflow sensor by changing air filter and cleaning the sensor.

Next come the check engine light for the knock sensor. I have just got it replaced.

Before I replaced the knock sensor, the car took an effort to reach 65 mph, the RPM would be 3200+. After I changed the knock sensor, I see the RPM comes down. @ 65, the rpm is below 3000. But the car has no power now. The acceleration is really bad. I notice the car shakes at idle slight more than before. I have changed the spark plugs.

I am not good with cars fixing. That's why I hope to get some idea and advices from you guys. Your help is truly appreciated.

One more thing, I felt that the shifting of the automatic is a little bit more rough than before. I am thinking about adding some Lucas transmission fix into the transmission fluid and see if it helps. Is it ok to do that ? I see the color of the transmission is pretty clear and no smell.

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post #2 of 29 (permalink) Old 12-09-2016, 11:18 PM
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MAF and knock sensor problems can cause the computer to retard the ignition and lose power. Could be the sensors really are bad, or an electrical issue. I fixed mine just by adding a couple ground straps to better ground the engine but I was lucky.

How many miles? These cars like to clog up the catalytic converter, hasn't happened to mine yet but I believe the two main symptoms are a lack of power and decreased MPG. I think they like to clog up around the 130k miles mark, mine is at 127k Possible the back pressure from the clog can be causing the sensor problems too.

Just my opinion, but I'd leave the trans alone. These automatics are pretty delicate. It's probably feeling odd because the engine isn't running well.

Current cars: '03 Rio, '98 S-10, '03 Taurus, '02 Rio, '05 Prius
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post #3 of 29 (permalink) Old 12-10-2016, 01:20 AM Thread Starter
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MAF and knock sensor problems can cause the computer to retard the ignition and lose power. Could be the sensors really are bad, or an electrical issue. I fixed mine just by adding a couple ground straps to better ground the engine but I was lucky.

How many miles? These cars like to clog up the catalytic converter, hasn't happened to mine yet but I believe the two main symptoms are a lack of power and decreased MPG. I think they like to clog up around the 130k miles mark, mine is at 127k Possible the back pressure from the clog can be causing the sensor problems too.

Just my opinion, but I'd leave the trans alone. These automatics are pretty delicate. It's probably feeling odd because the engine isn't running well.
Thanks for your comment. Mine is at about 110K. What bothers me is that MPG were ok just a few weeks ago, until the check engine light comes up. Any remedy for cleaning up converter without replacing it ? Someone on youtube was suggesting adding the lacquer thinner into the gas tank.
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post #4 of 29 (permalink) Old 12-10-2016, 04:48 AM
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After I changed the knock sensor, I see the RPM comes down. @ 65, the rpm is below 3000.
The knock sensor cannot impact on the rpm vs speed ratio.

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But the car has no power now. The acceleration is really bad. I notice the car shakes at idle slight more than before. I have changed the spark plugs.
What's the service history, at what interval is the oil and oil filter changed, when last was the oil and filter changed, when last was the timing belt changed, air filter, ......


I'd check the timing belt and confirm that the timing marks are correct.



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post #5 of 29 (permalink) Old 12-10-2016, 10:52 AM Thread Starter
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Thx for the suggestion. Below is the maintenance records I have.

Car currently has 110K miles on it.

1. Timing belts changed around 90K
2. motor oil changed around 105K with full synthetic oil ( 5K miles ago )
3. Air filter changed at 105K ( 5K miles ago )
4. spark plugs changed just now.
5. transmission fluid changed around 90K mil
6. Just cleaned the MAF and changed the knock sensor.

RPM with respect to speed is the only noticeable change I see after the knock sensor was changed.
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post #6 of 29 (permalink) Old 12-10-2016, 11:15 AM
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How about a fuel filter, and I am not sure if it has one but maybe an EGR valve problem? Also has this started since the switch to Calif. winter blend gas?
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post #7 of 29 (permalink) Old 12-10-2016, 11:15 AM
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I'd check the timing belt and confirm that the timing marks are correct, and the possibility of a plugged CAT as @PowerWagon suggested.

If you cleared the codes, have any reappeared?

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post #8 of 29 (permalink) Old 12-10-2016, 04:26 PM Thread Starter
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Not sure about the winter blend gas. The problem popped up a couple of weeks ago. After changing of the knock sensor, I have not seen the code coming back yet. Next thing I try is to add more ground straps, look into the timing belt and possibly the EGR valve >

If there are any more idea, please keep them coming. TIA
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post #9 of 29 (permalink) Old 12-12-2016, 09:37 PM Thread Starter
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Got an update: I have a code reader hooked up while driving to work. In the rush hour traffic, I got another code. This time it is a misfire on cylinder 4. There is no check engine light and it is the first time I get this code. On my return trip, I did not register other error code. Now, I jerry rig a ground strap from the battery negative terminal to a screw hole on the motor, next to the ignition distributor. I will see if that makes a different tomorrow drive to work.
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post #10 of 29 (permalink) Old 12-13-2016, 12:50 AM
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Not sure about the winter blend gas. The problem popped up a couple of weeks ago. After changing of the knock sensor, I have not seen the code coming back yet. Next thing I try is to add more ground straps, look into the timing belt and possibly the EGR valve >

If there are any more idea, please keep them coming. TIA
Have you investigated the ideas already posted?

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