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I have a 2002 Oldsmobile Bravada. The engine sounds like it has a miss and running really rough and losing power. I have tried everything. What next?

The first thing we noticed was when making a sharp turn it was hopping. Bought a transfer case and right before I switched it out the engine sounded like it had a miss. I went ahead and changed the transfer case and that fixed the hopping problem. It still had the miss. I changed the spark plugs which changed nothing, still a miss. Went back and double checked the gap in plugs and it was all right. No change. Put it on handheld scanner and it said it was miss firing. Took the tailpipe loose and beat a bunch of stuff out of the catalytic convertor and put it back together and still the same rough running with a miss plus the catalytic converter is red hot after another 5-10 minutes.

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  • Oldsmobile Master
  • 2,443 Answers

Converter needs replaced. What was the code?

Posted on Apr 22, 2017

Testimonial: "The code was just for a miss fire. I think he is going to cut it back behind the tale pipe where he can get back in there and try to clean it out. Trying to fix it cheapest way possible!"

  • Jennifer Dobbs
    Jennifer Dobbs Apr 22, 2017

    I will do that as soon as I get a chance. Thanks so much! Then I will post the results here for others.

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2 Answers

Center differential


IF you are in constant 4wd then you will not have a centre diff unless you have an AWD. The difference is that AWD transfer cases have a centre diff that allows different road speeds between the front and rear diffs as in going over speed bumps and dips ion the road It is the same operation in the front and rear diffs that allow one wheel to go faster than the other when cornering. However in 4wd drive there is no diff action in the transfer case and both front and rear axles drive at the same speed regardless of speed bumps and dips in the road . This action produces what is known as torque wind up which results in the handling characteristics. This torque wind up places stress on all the drive line train and results in failures such as .that you describe.. This wind up is not noticeable when driving on loose surfaces slippery surfaces or in mud as it is allowed to escape when the wheels spin . If you have an AWD with diff lock capabilities then check that the diff lock is operating correctly

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2003 bravada engine low power sounds like it's starving for air


Could be a vac leak or a problem with the EGR valve.
Do you have any codes other than for the missing cat ?

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1997 ford explorer awd binding in tight turns


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My 98 f150 was in 4WD Hi this morning when I started it. Selector switch is in 2WD position. 4WD Hi light is on, hubs (or front differential) is engaged and transfer case engage. (Feel front wheel hop...


If the switch was in the 2WD position and the transfer case was locked in a 4WD range, my 2 SWAGs would be bad switch or the connector to the shift motor is damaged / corroded or the fuse to the transfer case shift relay module is blown ( fuse # 17 ) / problem with the transfer case shift relay module.

This is without knowing if the truck was used in 4WD the night prior, and shifted out just before turning off. If this is the case, the shift motor might be stuck, and a few hits with a dead blow hammer to the transfer case might jar it free again ( do not use a metal hammer, it could damage the transfer case ).

The vacuum shift solenoids on the firewall are controlled by the GEM ( Generic Electronic Module ) which is grounding either the 2WD or 4WD solenoid, depending on the shift plate contacts in the transfer case. ( when in 4 or 4H, the contact switch plate signals the GEM, which in turn grounds the correct solenoid ).

Pulling the switch will not cause the transfer case to go back to a default position, the switch has a resistance level for each mode, and needs that value to operate the shift motor.

The resistance values for the switch between the 2 dark blue wires:
2WD - 4100 to 3700 ohms
4H - 1050 to 1150 ohms
4L - 380 to 340 ohms
- find the wire locations on the switch, mark them and remove the connector to test the resistance.

Just my opinion on the order :

1. Check the fuses for the shift motor
2. Try the old school shift method, back up ~ 50' put into park or neutral, and shift from 4WD to 2WD.
2.1. This is to see if the transfer case shift motor is bound up, and reversing might release it
3. Try hammering the transfer case with a dead blow hammer while someone shifts from 2WD to 4WD. You only need the key in the run position, if it happens quick enough after running the engine, the vacuum reservoir will still have enough vac to operate the solenoids. Don't chance running yourself over.
3.1. If this frees up the shift motor and the vacuum has bled off, you can try starting the truck and shifting into 4H then back to 2WD to get the front axle to disconnect or manually vacuum operate the front disconnect motor by applying vacuum to the pink vacuum line on the shift motor on the front axle.

Mar 05, 2011 | 1998 Ford F150 Regular Cab

1 Answer

My 2002 oldsmobile bravada wont start what do i do?? Ok I drove my bravada the other night it ran fine I just noticed a clicking noise but did'nt think anything of it cause truck was running fine no power...


No one can guess from afar

You need to have the vehicle to run
some tests

Worn out Battery or Run Down
Bad Starter Solenoid
Bad Starter

Gas doesn't freeze.

You know how to fix it
You have a local repair shop
pick it up,diagnose and repair

Feb 02, 2011 | 2002 Oldsmobile Bravada

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