Code Fun! Running bad. Codes 24, 34, 44
Thread Starter
Burning Brakes
Joined: Oct 2000
Posts: 792
Likes: 0
From: Palatine
Code Fun! Running bad. Codes 24, 34, 44
24- Vehicle Speed Sensor
34- Manifold Absolute Pressure sensor low
44- Lean Exhaust Pressure
Car runs lean (obvious). First few minutes of driving it bogs and backfires. Will replacing the Manifold Pressure Sensor fix the prob(Lean)?
34- Manifold Absolute Pressure sensor low
44- Lean Exhaust Pressure
Car runs lean (obvious). First few minutes of driving it bogs and backfires. Will replacing the Manifold Pressure Sensor fix the prob(Lean)?
Team Owner
Joined: Sep 2001
Posts: 62,171
Likes: 1,735
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: Code Fun! Running bad. Codes 24, 34, 44 (Blues77)
Fix from the front backwards, so i would fix the 34 first, then reset and i'll bet at least one of those other 2 disappears.
Thread Starter
Burning Brakes
Joined: Oct 2000
Posts: 792
Likes: 0
From: Palatine
Re: Code Fun! Running bad. Codes 24, 34, 44 (Blues77)
Code 34 seems odd to me, because I dont see any charts that relate it with a 94. In Haynes I see 34- MAF Prob years 85-90. Or code 34 1984 and 1991 through 93 models MAP sensor low. So why am I getting code 34? Is there a MAP on 94's?
[Modified by Blues77, 4:38 PM 4/14/2003]
[Modified by Blues77, 4:38 PM 4/14/2003]
Safety Car
Joined: Feb 2002
Posts: 4,212
Likes: 10
From: Sun City West Az
Re: Code Fun! Running bad. Codes 24, 34, 44 (Blues77)
Code 34 seems odd to me, because I dont see any charts that relate it with a 94. In Haynes I see 34- MAF Prob years 85-90. Or code 34 1984 and 1991 through 93 models MAP sensor low. So why am I getting code 34? Is there a MAP on 94's?
Le Mans Master
Joined: Feb 2002
Posts: 7,858
Likes: 2
Re: Code Fun! Running bad. Codes 24, 34, 44 (ittlfly)
I believe you have both a MAF and a MAP on your car.
It sits on top of the intake just behind throttle body on passenger side secured with two torx bolts (MAP sensor upside down view):
[Modified by Lone Ranger, 4:05 PM 4/14/2003]
Thread Starter
Burning Brakes
Joined: Oct 2000
Posts: 792
Likes: 0
From: Palatine
Re: Code Fun! Running bad. Codes 24, 34, 44 (Blues77)
Replaced the MAP, no luck there. Still pops, detonats (sp?), with quick revs. Took off whole intake, MAS and all, just open TB, and it seemed to idle smoother for awhile, but it didnt last. Still huntin...
:chevy
[Modified by Blues77, 4:38 PM 4/14/2003]
:chevy
[Modified by Blues77, 4:38 PM 4/14/2003]
Team Owner
Joined: Sep 2001
Posts: 62,171
Likes: 1,735
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: Code Fun! Running bad. Codes 24, 34, 44 (Blues77)
Did you reset the computer, does the 34 come back?
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Melting Slicks
Joined: Jun 2002
Posts: 2,168
Likes: 16
From: Phoenix AZ
Re: Code Fun! Running bad. Codes 24, 34, 44 (Oldman)
If this pertains to your '77, you might want to post in the C3 forum. :thumbs:
How many codes do you think you are going to get from a car that was manufactured in 1977? :lol:
Thread Starter
Burning Brakes
Joined: Oct 2000
Posts: 792
Likes: 0
From: Palatine
Re: Code Fun! Running bad. Codes 24, 34, 44 (vader86)
I must not be reseting the ECU correctly. I unhooked battery for a good 5 min. also unplugged ECU, still shows the same codes. Also, does the engine light have to come on in order for the ECU to record the problem?
Off to autozone to buy a fuel pressure gauge... :)
Oldman, Vetracer - :lol: , the 77 needs so much work. Im sure code 13 "Rob a bank" would come up.
[Modified by Blues77, 5:26 PM 4/14/2003]
Off to autozone to buy a fuel pressure gauge... :)
Oldman, Vetracer - :lol: , the 77 needs so much work. Im sure code 13 "Rob a bank" would come up.
[Modified by Blues77, 5:26 PM 4/14/2003]
Melting Slicks
Joined: Jun 2002
Posts: 2,168
Likes: 16
From: Phoenix AZ
Re: Code Fun! Running bad. Codes 24, 34, 44 (Blues77)
How are you retrieving the codes? I got a similar batch of codes on my '86 and it was because my Diacom software wasn't running properly on my laptop. I assume you must be working on your dad's '94 - on my '86 you can read the codes by the number of "check engine " flashes to verify that the codes you are retrieving via scanner are really present.
Thread Starter
Burning Brakes
Joined: Oct 2000
Posts: 792
Likes: 0
From: Palatine
Re: Code Fun! Running bad. Codes 24, 34, 44 (vetracer)
Retreiving codes by de ol jump terminals A+B method.
Fuel Pressure while running reads 32 psi, its not a smooth reading, it bumps around the 32 mark. With ignition on, car off it rises to like 20 or so then falls to 15.
bare with me... I have 10+ things going on in this post. :rolleyes:
[Modified by Blues77, 6:22 PM 4/14/2003]
[Modified by Blues77, 6:46 PM 4/14/2003]
Fuel Pressure while running reads 32 psi, its not a smooth reading, it bumps around the 32 mark. With ignition on, car off it rises to like 20 or so then falls to 15.
bare with me... I have 10+ things going on in this post. :rolleyes:
[Modified by Blues77, 6:22 PM 4/14/2003]
[Modified by Blues77, 6:46 PM 4/14/2003]
Safety Car
Joined: Feb 2002
Posts: 4,212
Likes: 10
From: Sun City West Az
Re: Code Fun! Running bad. Codes 24, 34, 44 (Blues77)
Take the rubber bladder off the top of the fuel tank( via the filler door). Put the pressure guage on the schrader valve, key on enging off, clamp the delivery line (to the engine) and see if the guage falls or remains the same. If it holds pressure, you have a bad pump, pump damper or bad check valve in the pump. If the pressure falls we'll go from there. It seems your FP pressure is to low and I suspect a pump problem. BTW, when did you last change you fuel filter?
[Modified by ittlfly, 5:45 PM 4/14/2003]
[Modified by ittlfly, 5:46 PM 4/14/2003]
[Modified by ittlfly, 5:45 PM 4/14/2003]
[Modified by ittlfly, 5:46 PM 4/14/2003]
