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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > Z Series > E36/7 Z3 (1996-2002)

E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

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  #1  
Old 06-03-2014, 07:22 PM
jcfoshe jcfoshe is offline
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Poor power m52 motor

I just bought 98Z3 2.8 L. I drove this car 9 months ago and it was fast. The owner only drove it 2 time after that and it has sat 8 month with out a gas cap. I installed a new cap but the car is gut less. It acts like it is bogging down. It will only go up to about 3500 RPM when going through the gears (it's a 5 speed). Foot on the floor it will only go 60 MPH and 2800 RPM. I put new spark plugs in and it helped a little but no where near what it should. I put a can of sea foam in a full tank of gas and have ran a little over 1/4 tank so far. I also just put a new fuel filter on. I run a fuel rail pressure test it was 50 PSI then started it and it held 47PSI. Any ideas or next steps?



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  #2  
Old 06-03-2014, 08:11 PM
Blacklane Blacklane is offline
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Often a lack of power at high RPM is due to a blockage in the air intake system. Have you looked for a mouse nest in the air filter box or intake pipes? Bad air filter? Bad MAF sensor?
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  #3  
Old 06-04-2014, 05:41 AM
jcfoshe jcfoshe is offline
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I did look at the air filter, which was clean. I did not look check inside the intake lines but will and see.

Chris
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  #4  
Old 06-04-2014, 05:51 PM
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amancuso amancuso is offline
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Clogged catalytic converter? Do you have a CEL?
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  #5  
Old 06-04-2014, 08:00 PM
jcfoshe jcfoshe is offline
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What is a cel? I did find that the rubber boot between maf and throttle body has several large cracks so I hope to pick one up at BMW tomorrow.


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  #6  
Old 06-05-2014, 04:48 AM
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amancuso amancuso is offline
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Check Engine Light. (Service Engine Soon)
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  #7  
Old 06-05-2014, 05:54 AM
jcfoshe jcfoshe is offline
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Yes the check engine light is on. It run so poorly I could not get it to the parts store to pull the codes. I am checking to see if I can get that hose today and see how it runs, hopefully I can get it to the parts store and pull the codes.
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  #8  
Old 06-05-2014, 07:53 AM
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That hose would not cause that. it would just bring unmetered air into the intake. I'll bet your cat has taken a dump.
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Old 06-05-2014, 03:09 PM
Blacklane Blacklane is offline
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Wait, you're having engine problems and you didn't think the check engine light was relevant? You've started replacing parts without getting the codes read?
By all means, get the codes read somehow. If the Check Engine light is on, there will be codes set. They will tell you what test failed and provide valuable insight into what is wrong.
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  #10  
Old 06-05-2014, 04:27 PM
jcfoshe jcfoshe is offline
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I replaced parts I knew where bad. I pulled the spark plugs and they were shot. I looked at the intake boot and it had a large tear. So these would have needed to be replaced anyways. Now I have the new intake boot on it still is doing the same thing. I drove it and pulled the codes and I got P1423 (secondary air system bank 1) P1250 (manifold absolute pressure too high) P0455(generic: evaporative emission system leak detected) P0141(generic O2 heater circuit bank1 sensor 2). This was the order of them. I erased the codes and they did not set off the check engine light when I drove home, still running like crap.


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  #11  
Old 06-05-2014, 05:41 PM
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vintage42 vintage42 is offline
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Quote:
Originally Posted by jcfoshe View Post
... pulled the codes and I got P1423 (secondary air system bank 1) P1250 (manifold absolute pressure too high) P0455(generic: evaporative emission system leak detected) P0141(generic O2 heater circuit bank1 sensor 2). This was the order of them. I erased the codes and they did not set off the check engine light when I drove home, still running like crap...
Just clearing the codes does not solve the mechanical problems. The codes might return.
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  #12  
Old 06-05-2014, 05:55 PM
jcfoshe jcfoshe is offline
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I understand that. The car still will not go above 3000 rpm. I cleared the codes to make sure I had any old codes removed. Now that they are all gone I wait to see if a new one showed up which non has yet.

I don't know if a clogged cat would set a code. Would the fuel pressure regulator cause the car to do this? I put a fuel pressure gauge and check running and it was fine. I see that it has some 3/2 valve by the pressure regulator what is that for and would it cause my issue?


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  #13  
Old 06-05-2014, 07:56 PM
Z3Papa Z3Papa is online now
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The issues he described with the rubber boot behind the MAF will cause the car to throw a huge variety of CEL codes and go into limp mode. Wait until he gets those parts replaced, clear the codes, allow re-adaptation, and see if there is an improvement. A clogged CAT will throw a code but realistically speaking a smoke test will likely be in order to find the air/vac leaks first.
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  #14  
Old 06-06-2014, 04:36 AM
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If the torn intake boot behind the MAF was the cause of the poor running, would not his replacing that boot immediately make the engine run better?
Yet he replaced the boot and it made no difference. It will be interesting to see what codes, if any, re-appear.
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  #15  
Old 06-06-2014, 04:46 AM
jcfoshe jcfoshe is offline
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After work I am going to try and run the car with a fuel pressure gauge connected to the fuel rail. I would assume that the pressure should stay around 50 psi while driving. This should rule out fuel issue or point to one I hope.


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  #16  
Old 06-06-2014, 05:06 AM
Blacklane Blacklane is offline
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This still sounds like an airflow problem to me, not a fuel problem. At high RPMs, the engine has to move much more air than fuel, so a dramatic change in performance is more indicative of an airflow problem.
I think you might have a restriction in the intake system such as clogged filter, bad TSP, or closed DSC valve. At least that stuff is easy to inspect. I think it's more likely that you have a clogged exhaust such as a crushed pipe or clogged catalytic converter or muffler. You can rent or borrow a pressure gauge that goes into the pre-cat oxygen sensor port to diagnose that.

Correction based on one of your later posts: Yes. I meant Throttle Position Sensor, or TPS.

Last edited by Blacklane; 06-06-2014 at 01:34 PM.
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  #17  
Old 06-06-2014, 05:45 AM
jcfoshe jcfoshe is offline
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Installing a gauge on the pre-cat sensor port, do you just check this at idle or is this something that needs to be check going do the road? Can you just hang the sensor while doing this or do you need to disconnect it?
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  #18  
Old 06-06-2014, 05:59 AM
jcfoshe jcfoshe is offline
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Blacklane,

I know my air box is clean, my filter is clean, the Throttle body looks clean, MAF looks clean.
I could not see on RealOEM where my car has TSP or DSC. I do not know what TSP actually is, did you mean TPS (throttle position sensor). I know on my 530I I had to change the DSC, but RealOEM stated there was not one on the Z3.

Last edited by jcfoshe; 06-06-2014 at 06:15 AM. Reason: added to
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  #19  
Old 06-06-2014, 06:22 AM
khammack khammack is offline
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You can check the MAF by unplugging it. When unplugged it goes to default settings. A friend of mine was getting all sorts of codes, none of which indicated the MAF and his Roadster ran like crap. It turned out to be a bad MAF.
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  #20  
Old 06-06-2014, 09:11 AM
jcfoshe jcfoshe is offline
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I have an appointment to have the cat tested. I need to know how to tell with a 5 speed if the car has gone into Limp Mode.
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  #21  
Old 06-06-2014, 01:17 PM
jcfoshe jcfoshe is offline
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I unplugged the MAF. Did not change anything.


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  #22  
Old 06-06-2014, 02:57 PM
jcfoshe jcfoshe is offline
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Had the exhaust system checked. They said the temperature reading test was higher than normal which indicates it cat has some blockage. They quoted me $680 to replace the cat. I am thinking about just gutting it first to see if it fixes the problem before dropping $680 and it still does not fix it.


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  #23  
Old 06-06-2014, 04:59 PM
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vintage42 vintage42 is offline
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Quote:
Originally Posted by jcfoshe View Post
Had the exhaust system checked... cat has some blockage. They quoted me $680 to replace the cat...
You said you already replaced the cat after buying the car last December. Where did you get that cat -- was it new or used? And this second cat, will it be new or used?
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  #24  
Old 06-07-2014, 09:53 AM
jcfoshe jcfoshe is offline
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I want to thank everyone reading and giving my input back on my talking through a thought process. It was the cat plugged.


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  #25  
Old 06-07-2014, 11:36 AM
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vintage42 vintage42 is offline
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... It was the cat plugged.
So you replaced the cat in December and it's already plugged up? Whatever caused it to plug up so fast should be corrected before putting on another cat.

Last edited by vintage42; 06-07-2014 at 11:37 AM.
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