Elantra XD (2001-06) :: Loss Of Power And Speed At 100km/h - No CEL
Mar 7, 2014
Firstly, I've had an extensive look through the forum for existing threads dealing with this issue and have found a couple that seem to match... however I'm not entirely sure because noted that they had the car CEL come on... My wife's car doesn't. These threads dealt with gear shift flare, range selector switch faults, ECM reprogram - RPM flatspot... All except the latter noted that the CEL light came on...
Our problem - Loss of power and speed at 100km/h (auto trans)
In fourth gear (auto) traveling at 100km/h, RPM at this stage has settled to around 2100-2300. Then kicks down into 3rd (I'm assuming) with RPM just above 3000, and with little acceleration slowly build up to 100km/h and then start losing.
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The car was taken to Advanced Auto where I received codes about the catalytic converter and the output sensor. I've known about the converter since I bought the car last year and the sensor was replaced. But I am still having problems with the car. My friend is literally having to drive it like it was a stick.
We fear it might be the transmission as I you can go in reverse with no problem. What it could be instead of the transmission?
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I have changed plugs, wires, coil rack & fuel pump module. Because someone else looked at it before I did, they erased stored codes. I have pulled 2 codes on 2 different occasions. The first was P0134 the second was P1166. Other times no codes were stored. I did notice that if I shut off ignition & restart it runs great for 10 or 15 seconds.
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I just replaced the battery (and positive cable end since it was corroded in place) and recently replaced the spark plugs (which were badly burnt). There is a check engine code for "catalyst underperforming" which seems unrelated.
I suspect my car has fuel delivery problems. It occasionally sputters while idling and often has power loss while driving if I try to accelerate hard. It seems to have trouble shifting into 4th gear from 3rd or 5th, but that may be another issue entirely.
What I should check to diagnose this, or replace to resolve it?
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I got a check engine light one day and i read the code. Came out to be 02 sensor code bank 1. So i order a denso o2 sensor and replace the part.
I drive the car for about 400 miles to reset monitors and get a check engine light. P0420 cat code. At this point the car drives with normal power and pickup.
1000 miles later my car has lost power. It doesn't have any get up or power when driving normally. I take the car to my local shop and they recommend replacing front cat. I replace front cat, same issue.
At this point i'm not sure if it is a transmission problem or maybe my 2nd cat or something else?
On the freeway if I put my pedal to the ground the rpms surge up very very slowly,
Also seems like the car doesn't shift till around 4k rpms, seems like previously it shifted sooner.
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For some reason it is reving really high. At about 100km/hr it revs at about 4000rpm. I have talked to my brother and he said it did not do this before. It is changing gears because I can hear it and watch the rpm's drop before going back up. In 3rd gear at 60 km/hr it revs at about 2100 rpm's.
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Fuel pump
Starter motor
Finally motor rebuild a month ago due to to broken piston ring, which was meant to be the cause of all the problems.I am still having the same problems and just noticed again oil was nearly empty. What else it could be?Catalytic converter? Ignition leads?If my motor was rebuilt could it be something else using the oil? Or are these symptoms of a other underlying problem that is causing all these?When my motor was pulled apart I was told was in very good condition apart from broken ring.
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I have a Hyundai Elantra 2004 automatic 4 doors. On my instrument cluster i have no speed, no rpm and the odometer is at 0. All the others signal are ok (fuel, engine coolant, lights, etc.) The car works great, so i think the problem is not the sensors.
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I've been having a problem over the past month with my base 2014 Elantra (33k miles). Sometimes when I go to start the car there is a complete loss of electrical power. One of a couple of scenarios will occur:
1) Key Fob will not unlock/lock doors:
*There is no power to anything (no dash lights, interior lights, car won't crank).
2) Key Fob will unlock/lock doors:
* Either all interior lights will be on and when I attempt to crank everything shuts off (no dash lights, interior lights, etc)
* Or Clock and radio are reset, car starts fine
* The battery checks out as far as voltage/charge.
* There are no visible fuse issues.
* There are no check engine lights.
I have had it in the dealer the past 4 days and they haven't been able to reproduce the issue. So far I have been able to eventually get it to start by opening and shutting doors, which would lead me to believe it is a loose connection somewhere, but again the dealer hasn't been able to diagnose anything.
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I’m having an issue with my 2004 Hyundai Elantra cutting off, and what to check for next. Basically I have a very intermittent issue where the car seems to lose electrical power for a split second (or possibly total loss of gas – as in, it doesn’t seem to be misfiring, just seems to totally lose all power). If it happens when I first start the car up, the car will start up for a second and then cut off. It also happens randomly when driving at any speed, and when it happens while driving, it just goes out for a split second, and then cuts back on and I can keep driving, so the RPMs Rev up for a second as a result when it kicks back on, but then goes back to normal. But it is completely intermittent, as in, some days it will not do it at all on my 30-min drive to work. I even went a whole week without it happening. But this week it has come back. Some days it will do it 3 times, some days 20 times. Some days its hard to get my car started, because it keeps cutting off when I start it. But so far after I try around 5-10 times it will start up and keep going. Also, this may indicate nothing, but when it goes out for that split second, I can hear a click, or electrical sounding click coming from the dash/instrument panel area. Which is what makes it seem electrical in nature, but I could be wrong, could be a spark/gas thing.
This has been happening it seems no matter what the weather is outside (its been anywhere from the 20s to 60s here in the last few weeks) and it doesn’t seem to matter if the car is warmed up or not. Also, so far the check engine light has not come on, so it makes me think it might not be a sensor, since those will usually trigger the light when they start going bad. Also, when the car is running, it runs perfect. Idles perfect, drives perfect, no misfires, no hesitation, etc. The ONLY problem is it cutting out. Also, it doesn’t seem to matter if the fuel tank is full or half empty. I had read in one place that if the vapor recovery charcoal canister gets full of gas, it will vent liquid fuel instead of vapor, which can result in car cutting off or running rough, but this usually only happens when fuel tank is full. So I suppose it could be this, but I doubt it.The car has 180k miles. Iridium plugs have 60k on them. Wires have 60k on them. Original fuel pump and fuel filter. I wouldn’t think it would be the filter since when it runs it runs perfect. I guess could possibly be the pump having an intermittent issue. Trying to avoid replacing that for now unless I knew it was the problem.
What I’ve done so far:
•I made sure the battery cables are tight and clean at the connection
•I checked as many grounds as I could find, they all seem good
•Alternator puts out a perfect amount of voltage
•I swapped the ECU main relay and fuse with another relay and fuse in the fuse box that were identical
•I swapped the Fuel Pump relay with an identical one in the box
•I replaced the Crankshaft position sensor
•I cleaned the Mass Airflow sensor (though it looked spotless)
•I looked around for any vacuum hoses that were disconnected. Didn’t find any
•I’ve tried resetting the ECU (unplug battery for a while) and I thought that fixed it at first, but then it came back a few days later. And now resetting ECU seems to have no effect.
Some possibilities of what it could be:
•Fuel pump intermittent issue?
•Camshaft position sensor?
•ECU problem?
•Catalytic convertor going bad?
•Some other sensor going bad?
•Possibly the vapor recovery charcoal canister is full of fuel as described above
•ignition coils – but I doubt it since you’d usually get a misfire/engine light when those go bad (from experience)
•Fuel pressure regulator – but I doubt it, based on the symptoms. Seems like I’d have other symptoms.
I’m not convinced of any of these above, and some of them I wouldn’t know how to check (like for a bad ECU). What it might be? Getting nervous driving 75mph on the interstate with someone behind me and the car cutting out. Luckily so far it doesn’t cut completely off when I’m up to speed with someone behind me!
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Symptoms:
-Car "Surges" at any speed. Loss of power is significant.
-Check engine light is on , DTC code = P0420
Tried:
-Fuel injector cleaner
-Spark plugs replaced around 40k miles ago
-Checked for leaking valve cover gasket (oil in plug wells) None
Can a clogged fuel filter cause this? At idle the car is fine, the symptoms seem to only occur when car is under load (In drive). My son drove this car an it always seemed empty meaning he never put much gas in it.
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Ok, so I was driving normal highway speeds and all of a sudden, I realize a major drop in power. I pull over and restart it and it changes nothing. Now when I floor it, it takes 20-30 seconds to get to 90K.
I checked the air filter... Nothing. Used a code reader... Nothing. Then I decided to pressure test the cylinders... Nothing, except now the check engine light is on.
The Ol Dub is still drivable, but it is extremely slow and rough at idle. I am thinking it might be a MAF or fuel filter.
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