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98 Firebird Codes P0442 & P0507 Rate Topic: -----

#1 User is offline   joesperformance 

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Posted 24 March 2011 - 08:55 AM

I have a 98 Pontiac Firebird 5spd. It is all stock

I am getting codes P0442 and P0507.

I looked up each code and this what they mean:

P0442 Evaporative Emission Control System Leak Detected (small leak)

This indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. In fact, the leak can be from a hole as small as 0.04" in diameter. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

A code P0442 most likely means one or more of the following has happened:

A loose or improperly affixed gas cap
A non-conforming gas cap (i.e. not factory/original brand)
A small leak/hole in a fuel vapor hose/tube
Other small leak in EVAP system
Faulty vent o-ring seal

I have not done much yet with this code, I am planning on replacing the gas cap to see. But I do smell gas outside of the car after running the car, dont smell gas inside the car, only outside. The engine light dont throw this code til i get down to about 1/4 tank of gas, then if i reset light and fill up it stays off til i get down to about a 1/4 again.


P0507 Idle Air Control (IAC) System RPM Higher Than Expected

This P0507 code is one that's sometimes triggered on vehicles that have electronic throttle control. That is, they don't have a regular throttle cable from the accelerator pedal to the engine. They rely on sensors and electronics to control the throttle. In this case, the P0507 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed that is greater than the desired (pre-programmed) RPM. In the case of GM vehicles (and possibly others) if the idle speed is over 200 rpm higher than expected, this code will be set.

A P0507 DTC trouble code may be caused by one or more of the following:

A vacuum leak
Leaking air intake after the throttle body
EGR valve leaking vacuum
A faulty positive crankcase ventilation (PCV) valve
Damaged/failed/dirty throttle body
Failed EVAP system
Failed IAC (idle air controller) or faulty IAC circuit

I have done replaced the PCV and IAC valve's (I did check the IAC Pintle distance and did the IAC reset). I reset the engine light and it stays off for about 500 miles, then comes back on. I noticed it takes a bit of holding the key to start the car and it idles around 1200 rpm all the time, cold or hot. I do not hear any vacuum leaks and I have sprayed the entire engine bay down tryin to find a vacuum leak and absolutely nothing found so far. Also the entire intake system (upper and lower manifolds and TB) were all cleaned when motor was rebuilt.

This post has been edited by joesperformance: 24 March 2011 - 11:58 AM

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#2 User is offline   joesperformance 

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Posted 25 March 2011 - 10:39 AM

any ideas? I am thinkin maybe the fuel / vapor canister might be faulty? Anyone else think this might be problem? Is there a way to test it to see if it is bad or leaking?
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#3 User is offline   GaryDoug 

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Posted 31 May 2011 - 02:46 PM

View Postjoesperformance, on 25 March 2011 - 10:39 AM, said:

any ideas? I am thinkin maybe the fuel / vapor canister might be faulty? Anyone else think this might be problem? Is there a way to test it to see if it is bad or leaking?


I have the same car and have fixed the code P0442 problem on mine. Initially I replaced both hose connectors on the fuel sending unit atop the tank (cut a big hole for that). That did not help much. Then I tested the vent valve out of the car and it was ok.
In the end, the biggest leak was a short 3" hose at the EVAC vent valve, which is under the car just ahead of the gas tank. The metal clamps had rusted away causing a loose connection at both ends. Since the hose was also badly deteriorated, I replaced it and the clamps.

This was a tricky one to troubleshoot. I used a vacuum pump and adapters, a multimeter, and several wire taps to assist me.

As for the canister, they always leak a little by design. The trick is testing it and knowing how much is permissable. I would recommend replacing it only if it appears damaged/cracked.

Another easy place to check is at the EVAC purge vacuum valve which is on the left top side of the engine. It's the one with two wires and two hoses attached. Check the hose with the quick connector for damage.


Attached File  evac vent valve in car.JPG (304.82K)
Number of downloads: 23
Attached File  evac vent valve hose.JPG (359.5K)
Number of downloads: 31
Attached File  Evac purge valve 98TA.JPG (228.19K)
Number of downloads: 32
Posted Image
1998 Trans Am - LS1/A4 - all stock and almost all original - one owner - driven daily
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#4 User is offline   LazyEyeMcFly 

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Posted 04 September 2011 - 06:04 PM

Wow Gary! Im printing out that last picture right now...Very helpful...
79 Firebird Coupe....Cammin' Pontiac 350--------junk yard with cracked frame
75 Trans Am......Cammin' Pontiac 455, Ram Air 4 Cam, Heads 2,11 / 1,77 -----sold
96 Formula.....6 speed... 13.6 quarter mile stock
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#5 User is offline   GaryDoug 

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Posted 04 September 2011 - 07:40 PM

Wasn't used to a new camera photo format yet and got the resolution/size wrong. I learned later. And I did finally realize I was typing EVAC instead of EVAP.
Posted Image
1998 Trans Am - LS1/A4 - all stock and almost all original - one owner - driven daily
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