Santa Fe 2004 poor accel - Hyundai Forums : Hyundai Forum
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#1 Old 05-14-2012, 02:31 PM
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Santa Fe 2004 poor accel

I have a Hyundai Santa fe 2004 6cyl 2.7 L , AWD. I am having problem of slow acceleration which is worse after a stop sign or red light. Sometimes while taking turns I feels like that I will not move and I was lucky to be not hit by a Car coming from opposite direction while taking a left turn today.

The Truck’s exhaust pipe broke recently and a auto garage welded it. But I am facing the above problem immediately after the repair of exhaust pipe. If I put more pressure on gas pedal then a mal function indicator comes and today I took it to another mechanic and he gets the error code of P0303 –engine misfire and wants to charge me ~ $600 $ to replace spark plugs and wires. The mal function indicator goes off also while I am driving and can comes back after a while or a day. With the indicator on, the car drives erratic (minor jolts ) for few metres and then its fine. Since when I am driving on highways then I can go higher speeds without any problem. Do you guys think it’s still misfire issue???

Last edited by satin1410; 05-14-2012 at 02:46 PM.
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#2 Old 05-14-2012, 05:27 PM
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Originally Posted by satin1410 View Post
I have a Hyundai Santa fe 2004 6cyl 2.7 L , AWD. I am having problem of slow acceleration which is worse after a stop sign or red light. Sometimes while taking turns I feels like that I will not move and I was lucky to be not hit by a Car coming from opposite direction while taking a left turn today.

The Truck’s exhaust pipe broke recently and a auto garage welded it. But I am facing the above problem immediately after the repair of exhaust pipe. If I put more pressure on gas pedal then a mal function indicator comes and today I took it to another mechanic and he gets the error code of P0303 –engine misfire and wants to charge me ~ $600 $ to replace spark plugs and wires. The mal function indicator goes off also while I am driving and can comes back after a while or a day. With the indicator on, the car drives erratic (minor jolts ) for few metres and then its fine. Since when I am driving on highways then I can go higher speeds without any problem. Do you guys think it’s still misfire issue???
Well, for starters, here is a guide to change your own spark plugs by yourself. If you shop for plugs and wires, you should be able to get them for under 100 dollars. Just follow this step by step guide and you should be done in less than three hours tops.

Hyundai Santa Fe Spark Plug replacement on a V6 Cyl

Much cheaper than having the shop do it and you won't leave any bolts out.
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#3 Old 05-14-2012, 07:05 PM
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I wonder if the repair welding of the exhaust pipe did not cluther it or somehow obstructs the exhaust gasses. The car seems to me being choked by not getting its exhaust fumes out in the open air.
Check for exhaust pressure at the end of the tailpipe by holding it closed with a cloth (it will dirty your hands) while revving the engine. It must be a firm flow, impossible to keep the pipe closed, not a gentle puff.

Good luck,
Paul
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#4 Old 05-14-2012, 08:37 PM
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thanks for your reply John and Paul.
When i also searched online for the causes , the exhaust clogging is one of the causes of the slow acceleration. Another one is transmission going bad or timing belt. But as a newbie i really can't figure out the problem. I will try by putting a cloth on exhaust as you suggested.

But I will change the spark plugs/ wires anyways since i have got 195k kms on it ( I'm second owner and bought it @ 145K kms) and never replaced anything except engine oil, transmission oil and break pads/rotors.
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#5 Old 05-15-2012, 08:39 AM
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Originally Posted by satin1410 View Post
thanks for your reply John and Paul.
When i also searched online for the causes , the exhaust clogging is one of the causes of the slow acceleration. Another one is transmission going bad or timing belt. But as a newbie i really can't figure out the problem. I will try by putting a cloth on exhaust as you suggested.

But I will change the spark plugs/ wires anyways since i have got 195k kms on it ( I'm second owner and bought it @ 145K kms) and never replaced anything except engine oil, transmission oil and break pads/rotors.
You should also check to make sure you have full oil in your transfer case if you have a 4wd. These santy's transfer cases are know to slow leak and eventually get to the point where they won't run any more. It is a very expensive part to replace and would give a slow acceleration appearance as it is going out. Most Hyundai shops(at least mine didn't) don't check the transfer case for fluid when they do those multi-point inspections. I have put a regimented routine of filling the transfer case each time I change oil and don't worry about the slow leak.

Last edited by johnaauld; 05-15-2012 at 08:42 AM.
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#6 Old 05-15-2012, 10:23 AM
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Well, I don't know if this applies on the Santa Fe or not, but I know I had a 2001 Kia Sportage (very similar motor to the early Santy), and when I took it to the dealer he told me that sometimes the Woodruff key works loose and tries to "wallow out" and that will cause misfire codes if you have already checked your plugs and wires. That would be the next thing I would check.
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#7 Old 05-15-2012, 05:08 PM
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Thanks, Johnaault for mentioning the transfer case. I didn't know.
I've never checked it, but as my Santa now also has some 195k kms on it it could never fail to look and change or fill up..
Good luck with the repairs,
Paul
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#8 Old 05-15-2012, 05:52 PM
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I odered the spark plugs and wires set online for under $60 ans waiting for theae to arrive . I forgot to mention one thing that when check engine light is on then the driving is very jerky at very low speeds(10-20 km/h) however at higher speed its better.

Another thing is that When I stop on a red light I get a gentle forward push as if some one pushed the santy from the back.
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#9 Old 05-19-2012, 08:24 AM
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Well, the jerky motion at slow speed could indicate an almost stall of the engine, certainly connected to your slow acceleration fault. The engine cannot keep up the speed at low revs, it lacks the power.
Your check engine light comes up so you must have an error code, which could be read (by garage). That can give you a clou on your fault condition, although some error codes are somewhat open for interpretation.
I would check your exhaust for after that the faulty condition occurred.
Maybe the cat got clogged.
The other stuff, spark plugs, cables etc. are not connected to a faulty exhaust condition and will not correct anything. Simply a maintenance issue.
The other thing is the slight push at stoplights. Could indicate your clutch isn't disengaging enough so it will keep transfering some power to the drivetrain.
Check the function of your clutch pedal. Is it spongy? Maybe the clutch oil container is empty?

Good luck,
Paul.
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#10 Old 05-23-2012, 12:05 PM
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Dear All,

I tried changing the spark plugs and wires yesterday. I was able to do the front ones only. I followed the link given by Johnaauld (see below)

Hyundai Santa Fe Spark Plug replacement on a V6 Cyl

I was unable to remove the two bolts holding the main throttle cable bracket (Step 11 in the link) as there was not enough space to work. I bought some wrenches and flexible rotating wrench to do this part but was unable to remove these 2 bolts. Is there a special tool to do this if some one knows .

I also changed the steering fluid in the process.

But after changing the front 3 spark plugs , i still see no improvement. Probably the culprit is one of the rear ones as the (MIL code was P303) Once i am done with Plugs then i will do the tranaxle fluid and look into cat convertor or exhaust thing.
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