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Old 06-08-2012, 11:38 PM   #1
diplomat1
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1994 SL2
Default Loss of power/bogging?

Hey guys i have a 94 saturn sl2 dohc stick. The last couple of months my car seems like it has a loss of power. My acceleration is so bad and so is it in every gear. Also i dont know if this has anything to do with it but everytime i fill my gas up (when its low under e) and i put like $10 in when i start the car the rpm's go up then go really low around 300-400 until i give it some raise and then sometimes it still goes back but most of the time it doesnt, ANy ideas on why i have a bad loss of power. ALSO I CHANGED MY PLUGS LIKE 1K miles ago. And my spark plug all the way on the right has oil on the threads on the bottom of the plug. I need a new valve cover i know but i dont think its the cover thats giving oil to the spark plug well. What else could it be? I dont know what else to do. Thanks.

PS IF ANYONE IS SELLING ALUMINUM VALVE COVER DOHC FOR MY CAR WITH TORX BOLTS PLEASE LET ME KNOW. THANKS
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Old 06-08-2012, 11:42 PM   #2
fetchitfido
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2001 SC2
Default Re: Loss of power/bogging?

Unless your one of the unlucky '94's you should already have the aluminum cover, just need the premade gasket and then it won't leak into the spark plug wells anymore.

Carb cleaner and tooth/wire-brush to the throttle body and EGR, both should be removed to be properly cleaned.

Verify spark plug wires are in the right order and the air filter isn't clogged.
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Old 06-09-2012, 07:54 AM   #3
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Default Re: Loss of power/bogging?

Does the car exhibit any type of bucking or lurching under acceleration? How many miles are on it?
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Old 06-09-2012, 08:04 AM   #4
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2003 L-Series 3.0L Sedan
Default Re: Loss of power/bogging?

As mentioned, mileage? This may be a key to the next question? Catalytic converter clogged? Bang the bottom to check for loose cat guts (there shouldn't be any) and remove the O2 sensor for a LOUD drive. If there's renewed power then the catcon is plugged. Other issues may be with the fuel filter (replaced when?) and a pressure check.
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Old 06-09-2012, 08:12 AM   #5
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Default Re: Loss of power/bogging?

Also what kind of fuel filter did you buy? fdryer took the words out of my mouth regarding the catcon/catalytic converter.
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Old 06-09-2012, 06:34 PM   #6
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Default Re: Loss of power/bogging?

Quote:
Originally Posted by fetchitfido View Post
Unless your one of the unlucky '94's you should already have the aluminum cover, just need the premade gasket and then it won't leak into the spark plug wells anymore.

Carb cleaner and tooth/wire-brush to the throttle body and EGR, both should be removed to be properly cleaned.

Verify spark plug wires are in the right order and the air filter isn't clogged.
YES! I am unlucky i have the composite cover. I have been looking for a long time but can find a aluminum cover with bolts ANYWHERE!!. I cleaned my throttle body and egr valve last summer just like u said. Also my spark plugs are in the correct order for sure. Verified like 10 times.




Quote:
Originally Posted by dsquare86 View Post
Does the car exhibit any type of bucking or lurching under acceleration? How many miles are on it?
I have some bucking sometimes. Like i said my acceleration is pretty much gone. I feel like it has no power what so ever. Also i know my timing chain needs to be replaced can that be a big issue related to this?

Quote:
Originally Posted by fdryer View Post
As mentioned, mileage? This may be a key to the next question? Catalytic converter clogged? Bang the bottom to check for loose cat guts (there shouldn't be any) and remove the O2 sensor for a LOUD drive. If there's renewed power then the catcon is plugged. Other issues may be with the fuel filter (replaced when?) and a pressure check.
I have 180k on my car. I just fitted a new universal cat into my car but the loss of power has been way before the exhaust broke right at the cat. The only thing that may be no good is the o2 sensor. The fuel filter was replaced a year ago with a fram fuel filter. What kind of pressure check should i do?



Quote:
Originally Posted by dsquare86 View Post
Also what kind of fuel filter did you buy? fdryer took the words out of my mouth regarding the catcon/catalytic converter.
As said before, fram.
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Old 06-09-2012, 08:16 PM   #7
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Default Re: Loss of power/bogging?

1-How many miles on the new catcon?

2-With 180k miles, a compression test would help to develop the big picture.

3-What's fuel pressure? And was the fuel filter ever replaced?

4-Search for procedures on how to make a temporary blocking gasket for the egr valve and how it helps troubleshoot possible egr valve issues.
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Old 06-09-2012, 10:29 PM   #8
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Default Re: Loss of power/bogging?

1. Need fuel pressure test.

2. Whats wrong with your timing chain? Is it stretched beyond service limit or out of time?

3. If you have a pre cat attached to your exhaust manifold -- remove upstream O2 sensor and take for a short run (be careful not to melt your fan shroud) If this improves acceleration and hesitation then you are victim of a bad pre cat.
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Last edited by dsquare86; 06-09-2012 at 10:36 PM.
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Old 06-10-2012, 12:36 PM   #9
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1994 SL2
Default Re: Loss of power/bogging?

Quote:
Originally Posted by fdryer View Post
1-How many miles on the new catcon?

2-With 180k miles, a compression test would help to develop the big picture.

3-What's fuel pressure? And was the fuel filter ever replaced?

4-Search for procedures on how to make a temporary blocking gasket for the egr valve and how it helps troubleshoot possible egr valve issues.
About 1-2k miles on new cat converter. I have to test the fuel pressure on monday and will also do the compression test monday. Fuel filter was replaced last year about 12k miles ago. I have to look up the egr valve trick never knew that.

Quote:
Originally Posted by dsquare86 View Post
1. Need fuel pressure test.

2. Whats wrong with your timing chain? Is it stretched beyond service limit or out of time?

3. If you have a pre cat attached to your exhaust manifold -- remove upstream O2 sensor and take for a short run (be careful not to melt your fan shroud) If this improves acceleration and hesitation then you are victim of a bad pre cat.
Will do the fuel pressure test on monday. The timing chain is loose i believe becuase i hear it hitting inside somewhere and making a loud sound. I dont know how to tell if i have a pre cat or not. How can i tell?
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Old 06-11-2012, 09:50 AM   #10
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Default Re: Loss of power/bogging?

Quote:
Originally Posted by diplomat1 View Post
About 1-2k miles on new cat converter. I have to test the fuel pressure on monday and will also do the compression test monday. Fuel filter was replaced last year about 12k miles ago. I have to look up the egr valve trick never knew that.



Will do the fuel pressure test on monday. The timing chain is loose i believe becuase i hear it hitting inside somewhere and making a loud sound. I dont know how to tell if i have a pre cat or not. How can i tell?
This is the precat, on later model saturns like mine -- see attachment. Probably slightly different on your car. When you pull the valve cover, is the engine in time?
Attached Images
File Type: jpg precat600.jpg (56.6 KB, 21 views)
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Old 06-11-2012, 11:14 AM   #11
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Default Re: Loss of power/bogging?

Precat was on California cars, and ONLY those with S-AIR pumps 94' is OBDI meaning no requirements for meeting the restrictions that 96' and newer met.
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Old 06-11-2012, 11:25 AM   #12
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Default Re: Loss of power/bogging?

Quote:
Originally Posted by simkid5614 View Post
Precat was on California cars, and ONLY those with S-AIR pumps 94' is OBDI meaning no requirements for meeting the restrictions that 96' and newer met.
True, disregard my postings regarding the precat.
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Old 06-11-2012, 01:24 PM   #13
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Default Re: Loss of power/bogging?

Yes i have no pre cat but it is california regulations. I did the fuel pressure test and it came up with 41psi key on engine off and 38 with key on engine on. Does that sound right?
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Old 06-12-2012, 01:19 PM   #14
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Default Re: Loss of power/bogging?

Any.ideas?
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Old 06-12-2012, 02:02 PM   #15
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Default Re: Loss of power/bogging?

Do you have a haynes manual for your car?
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Old 06-12-2012, 04:24 PM   #16
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Default Re: Loss of power/bogging?

No i dont why? I connected the fuel pressure tester in my high pressure line thats hooked up to my fuel filter and those were the numbers that came out. Do they sound right?
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Old 06-13-2012, 06:38 AM   #17
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Default Re: Loss of power/bogging?

According to the Haynes manual your car should be:

31 to 36 psi at idle with vacuum hose attached to regulator
37 to 45 psi at idle without vacuum hose attached to regulator

Fuel pressure decay maximum after 5 minutes:

3 psi

Hope that helps.
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Last edited by dsquare86; 06-13-2012 at 06:41 AM. Reason: Spelling.
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Old 06-13-2012, 10:49 AM   #18
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2002 SL2
Default Re: Loss of power/bogging?

If the timing chain is loose enough to have skipped it will affect power output quite a bit. As suggested removing the o2 sensor and going for a short drive will rule out exhaust/cat related issues. It isn't to test the o2 sensor, it provides a way to bypass any possible exhaust obstructions.

I'm assuming you've replaced the ECTS?

Any codes?

Last edited by ssewall; 06-13-2012 at 10:58 AM.
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Old 06-13-2012, 11:24 AM   #19
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Default Re: Loss of power/bogging?

With the car at idle and in neutral, will the engine rev above 3.5-4k?
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