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Old 08-05-2008, 06:39 PM   #1
neil1138
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Car jerks around 50mph or during highway acceleration. Problem existent for a month

Well guys, I was hoping the car would throw a SES light but it hasnt for the past month. Here's the run down...

Car drives perfect during city driving but when I get right to 50mph and I am accelerating slightly, the RPM's jerk about 50 RPM's up and down as they go up. The car gains speed and everything, it just doesnt want to accelerate. It's almost like the car is misfiring and it is the same feeling. I know it doesnt have anything to do with the tranny so I have come up with a list of other possible problems:

1. Fuel pump
2. Fuel pressure regulator
3. Camshaft position sensors
4. Ignition Coils

I have already replaced the fuel filter and spark plugs since they were the cheapest. And NO, the car hasnt thrown a CEL or SES light. I simply am tired of waiting for one to be thrown and I want this problem fixed. I cant even drive on the highway because my car wont accelerate past 50mph. Well... if I am really on the gas, it will do just fine without missing. But if I am light on the gas, it will act like it is misfiring. Please help me.

I'm leaning towards ignition related but I dont know if it has anything to do with timing or fuel. It just seems as though it only does it at 50mph and up or when the engine is under load at those speeds.

Edit: I remembered that sometimes when I start the car, the SES light will flash on for a sec while all the other lights are going on. And sometimes it never lights up. I mean, you know when you turn your car on and all the dash lights come on then turn off like a split second later? yeah, like that. And YES, I do have a code reader and I have checked and no codes were present. I have checked like 20 times

Last edited by neil1138; 08-05-2008 at 06:43 PM.
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Old 08-06-2008, 12:49 AM   #2
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Help please. Anybody?
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Old 08-06-2008, 01:24 AM   #3
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At first it sounds like your car is in some sort of limp mode meaning possible transmission wear, but I think that type of limp mode is slower than 50mph...I'm not too sure. Other than that it could be your ECU malfunctioning! You said you were getting some lights on the dash and if your ECU isn't working correctly; then the code reader won't be able to get codes from the ECU, hence no SES light. Just a thought.
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Old 08-06-2008, 01:32 AM   #4
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I know there isn't any problem with the transmission because if it was slipping it would go into "limp home mode". And the lights? Please read the entire post man, I clearly stated that the SES light would turn on for a split second while all of the other instrument cluster lights came on WHEN I TURN THE CAR ON. You know how the car checks itself when you turn it on? Yeah, sometimes the light comes on and sometimes it doesn't. And back to the tranny, I know it's not transmission related because it doesn't happen when I'm going 45mph, and I thought the second the ECU sensed the Tranny slipped, a dash light comes on and the car goes into 3rd gear or something? And my ECU isn't screwed up, otherwise wouldn't 10 other things be failing? Im not sure if I'm right, I'm just guessing
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Old 08-06-2008, 09:17 AM   #5
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I hate bumping but I really need somebody to help me.
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Old 08-06-2008, 09:25 AM   #6
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How many miles are on your car??????? Check your O2 sensors. You have 4 of them. 2 pre-cat and 2 post-cat.
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Old 08-06-2008, 09:39 AM   #7
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Well I am at 127,000 miles. I have never heard of O2 sensors causing a car to act like it's misfiring during highway driving. And I thought if they really were screwed up, a SES light would come on and I could get a code. Thing is, I know there is a problem but Everytime I scan, I don't get any codes and there is no SES light.
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Old 08-06-2008, 09:50 AM   #8
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hmmm....this is a tricky one...bad gas could be another thing you might want to consider looking into....without codes its pretty hard to tell what the issue is....you pretty much named all the possible issues...i dont know what else it could be...do you have an cold air intake? could be a bad MAF???...or maybe you have a intake hose broken that goes to the throttle body...when going over 50mph those intake hoses are receiving a lot more air then when your driving slower...the pressure of the air could be opening a small crack in the hose that closes in low speed.....im sorry i cant help you out...im stumped myself
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Old 08-06-2008, 09:58 AM   #9
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I have a Dinan CAI. It's been on my car for about a 1,000 miles. I guess it could be the MAF... I'm also thinking it could be a vacuum leak of some type. I have already replaced my VANOS seals so. BUT sometimes at idle my RPMs dip just a bit, not as bad as the VANOS problem but more like vacuum leak type.

How do I check for vacuum leaks?

And it's pretty unlikely that I have bad gas for one month...
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Old 08-06-2008, 11:51 PM   #10
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bump. I really need help
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Old 08-07-2008, 03:04 AM   #11
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It does sound like some kind of vacuum leak, now that you've mentioned dipping rpms at idle. Best way to check is to do a smoke test, but some can get away with using carb cleaner.
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Old 08-07-2008, 09:50 AM   #12
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carb cleaner....turn the car on and spray it all over the intake tubes...if your engine idle drops then thats the carb cleaner getting into the throttle body because of a hole in the tube.


Quote:
Originally Posted by neil1138 View Post
I have a Dinan CAI. It's been on my car for about a 1,000 miles. I guess it could be the MAF... I'm also thinking it could be a vacuum leak of some type. I have already replaced my VANOS seals so. BUT sometimes at idle my RPMs dip just a bit, not as bad as the VANOS problem but more like vacuum leak type.

How do I check for vacuum leaks?

And it's pretty unlikely that I have bad gas for one month...
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Old 08-08-2008, 09:55 AM   #13
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bump
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Old 08-08-2008, 11:55 AM   #14
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Does the bump mean you already tried the vacuum leak test and nothing happened? Or you just want to get more ideas? Do that easy thing first.
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Old 08-08-2008, 12:58 PM   #15
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I want to get more opinions. The vacuum leak thing is probable but not very likely. It just seems weird that my tach does this madness. I want to be able to go as fast as I want to go. Not be afraid of going over 50mph. please help me everybody
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Old 08-08-2008, 01:23 PM   #16
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Hi Neil,

There has been multiple suggestions to help you and us diagnose and eliminate possible issues. It is true that the lack of check engine light doesn't help the matter one bit. You will need to start providing us with results from your testings that some members have suggested. Such as using TB cleaner externally to see if the rpm dips as part of the vacuum leak test.

Vacuum leak is a good possibility - and smoke test, if you smoke, or carb spray would help to ID that.

You mentioned that your car doesn't reach or exceed 50mph. In park, what is the maximum rpm you can obtain? And does it behave the same way when trying to rev in park.

Is your 328 auto or manual?
If the problem occurs at the same RPM in each gear, then you can eliminate your tranny. Try reving your engine while in park or neutral.

Do you notice DSC or ASC lights flashing when accelerating past 50mph?
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Old 08-08-2008, 01:35 PM   #17
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No, no, no. My car can go as fast as I want it to go. Its just that when i start inching up on 50mph, the RPMs are jerky and it feels as though the car is misfiring. I just dont LIKE to go over 50mph because of this problem.

Suppose this:

You are accelerating, the spedo is reaching 50mph and the tach is at about 2,000 RPM. When you reach ~50mph, your tach starts to jerk a little as it rises and your speed increases, it just feels as though the car is misfiring and if I step on the gas hard, the car powers through it and i can go as fast as i want. The car does fine when im coasting or accelerating hard, its when im barely accerating like normal city acceleration, that the car acts like its misfiring at speeds above 50mph.

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Old 08-08-2008, 01:41 PM   #18
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First, shrink ur sig jus a little. My laptop has a small screen and it's pain scrolling left and right to read your post.

Second, I think someone already asked but is ur car an auto or manual?

Third, see if any of these issues match yours. http://forum.e46fanatics.com/showthr...highlight=fuel

Good luck
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Old 08-08-2008, 01:43 PM   #19
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ok, fixed my sig. And my car is an auto.

And I looked at your thread, and I dont have any of those problems. thanks for the heads up tho.

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Old 08-08-2008, 02:21 PM   #20
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Ok, describe the problem a little more detailed... like does this happen while you're flooring it only? Does it happen even only at half throttle? Is it like a pulsing jerk or does it just dip once and then continue as normal? Does it sound like that if you just slowly apply throttle in a parked situation?\

EDIT: ok re-read your posts....does this happen even on a full tank of gas?
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