Question about 2002 Oldsmobile Bravada

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Losing power and using a lot of gas

Small evap leak shows on diag. Changed the gas cap and the light went out for a week and came back on. Now the Check engine (with same code) and the ABS light is on. Starting to SUCK gas and now the power is lagging. Recently had to change the Serpentine and the water pump and now this is going on. Also the dash lights DING constantly saying the Passenger Door is open.
Was thinking may be the timing with the power loss and usage of gas but dont want to go there first. Car usually runs like a top. Has 191500 on it

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  • Julie Beckstead Pierce
    Julie Beckstead Pierce Dec 08, 2012

    code is PO402 and the cap is on tight, new cap so seal is good, no catilitic smells, not getting loud. Just losing power and the constant dinging of the bell with the check engine and service AWD light on. TThe alarm will go off if I open the back hatch window and sometimes it says the back door *hatch* is open. Wonder if it could be the Power Dist box which holds the relays? Im not sure where that is located on the vehicle though. Was going to replace one of the relays but its dealer only. Thats a money grab with a vehicle thats 11 yrs old. Someone did do a bypass for the license plate light because they couldnt figure out where why it only came on with the door up but not down. but removed it when I found out there was a toggle switch put in for it.

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  • Contributor
  • 15 Answers

There are two power dist boxes in the bravada. one is under the hood and the second is under the back seat on the driver side. The bottom of the seat has to be flipped up to access the dist box inside the vechile. As for the loss of power and poor fuel usage, have you done a tune up on the suv. also have you done a fuel system cleaning? The awd light would suggest a problem in the transfer case or the front gear box. The one thing that could cause all the problems would be a body control module. Unfortunatly only a auto tech could tell which is the true problem. Hopefully I gave you some help on where to have someone look.

Posted on Dec 17, 2012

  • Julie Beckstead Pierce
    Julie Beckstead Pierce Dec 19, 2012

    I keep her tuned up and oil changed regularly so she just had a tune up, fuel filter change, ignition coil change on number 4 just went also and changed that. Changed teh brakes and rotors and thats when the light went out for the ABS but its back on again after a few months. So what am I looking for in the box under the seat? I took each one of the modules out of the one under the hood and cleaned the connections and checked all the fuses. No change. Under the seat has the body module in it? I will check that out next. Thanks and I will let you know.

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Posted on Jan 02, 2017

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SOURCE: loss of power

If car starts and lose the power afterwards it might be alternator problems or fuel supply (filter, pump, injectrors) or ignition (plugs, wiring/distributor). If lights come on but car is dead it is starter or incorrect timing (brocken timing belt (chain)) or fuses.
Hope that helps
Good Luck

Posted on Mar 03, 2009

  • 152 Answers

SOURCE: starting the car

If your check engine light is on then I would take it and have the computer codes pulled to see what fault the computer is showing. That will give you a better idea of what direction to go for repair. It doesn't sound like anything major, its probably a sensor issue. It could be your idle control solenoid, your collant temp sensor, or even your MAF sensor. You can try disconnecting these sensors to take them out of the loop (one at a time) and if it starts up with no gas pedal applied then you have found you problem. A fuel injected vehicle does not require you to give it throttle to start, the computer should take care of that. I would start by getting the codes pulled first, that should tell you exactly what is wrong with your vehicle. Your vehicle is starting and running so you have fuel and spark. I would look toward a control issue (sensors).

Posted on Apr 08, 2010

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1 Answer

Check engine light/evap leak


Getting a smoke test is the right direction to go in.
The computer vents the gas tank to the vapor canister while the engine is running. It also pressure tests the system for leaks. Some where between the gas tank and the vapor canister there may be a leaking hose or valve. Or it could be the gasket on top of the tank where the pump assembly went in.
The gas cap could have been a source for the leak, the other things are not involved.

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ENGINE light on, diagnostics test said gas cap was problem, I changed it, light went off came back on a couple weeks later, suggestions?


If an evap leak code is still setting, the next step would be to have someone pressurize the system with a smoke tester to determine where the leak is.

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I'm getting a P0452 code on my 2008 ford escape. EVAP small leak. What do you experts out there suggest I try ?? Thanks


Make sure you gas cap is tight and drive the car for a week. If the light stays on it could be a bad gas cap. Then again it could be a leak anywhere in the evap system. Gas cap is where the mechanics usually start.

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Hi, My engine light came on so I took it to AutoZone who told me it was the EGR hose so I had that replaced 2 weeks ago. Yesterday, the light came back on so back to AutoZone I went this morning. It is...


Usually this P0456 code is caused by an incorrect or faulty gas cap. Filling the fuel tank with the engine running could conceivable cause this code as well or if the cap wasn't properly tightened. Any of the following could also be the cause:
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Location of sensor for troubleshooting po442 to cause check engine light to come on


P0442 OBD-II Trouble Code - Evaporative Emission Control System Leak Detected (small leak)

What does that mean?
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.


Symptoms
You likely won't notice any drivability problems.


Causes
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


Possible Solutions
With a P0442, the most common repair is to:
* Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
* Otherwise, replace the gas cap, or
* Inspect the EVAP system for cuts/holes in tubes/hoses


46b629a.jpg

Fig. EVAP vent solenoid (2) on 3.1L, 3.4L, 3.5L & 3.8L, showing the connector (1) and vapor line (2)


510065b.jpg

Fig. EVAP canister purge solenoid location on 3.1L & 3.4L


a193655.jpg

Fig. EVAP purge solenoid valve (3) location on 3.5L




Hope this help, good luck.

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replace your gas cap and clear codes, then wait and see if light comes back on, if it does you have a more serious problem like a fuel tank leak or a defective fuel tank pressure sensor.

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If there was a leak at the gas cap. EG: Left off or loose after fill up? You will need to have the codes cleared or it will clear itself after enough key cycles. EG: Started and shut back off as many as 20 to 50 or more times.

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  • A small leak/hole in a fuel vapor hose/tube
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Possible SolutionsWith a P0442, the most common repair is to:
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