An expert who has achieved level 2 by getting 100 points
An expert that got 5 achievements.
An expert whose answer got voted for 20 times.
An expert who has written 20 answers of more than 400 characters.
Re: 98 olds bravada
If the relay is pulled, the fuel pump should not be running. If the mechanic is right, there is a short and your pump is getting electricity from somewhere it shouldn't. If that's not the case, the mechanic could be wrong. Post what the original problem was as a comment please.
a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US. click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need. Goodluck!
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
I would suspect the problem is the fuel pump. It is located inside the fuel tank. Next time this happens have a spray can of starting fluid with you, spray it into the air intake of the engine and see if it starts right up, if it does you likely need to replace the fuel pump.
Do you have power going to the pump from the relay when you turn the key on ?
You should be able to jumper the relay and power the pump to test pressure.
If you have normal fuel pressure it may be an injector problem.
There is a fuel pump prime cycle (2 or 3 seconds)when you turn the key to on and once you start the engine the fuel pump power comes though the oil pressure switch.No oil pressure,no power to the pump.maybe your oil pressure switch has become weak?I would use a scan tool and command the fuel pump on when it does shut off,just to make sure the pump can run,as it could be a bad pump too.Also when it does quit,if you turn the key off for 10 seconds, you should get a prime cycle by turning the key to on.Have someone listen at the gas tank for a fuel pump noise,which will be only 2 or 3 seconds,but will do as a pump running check.Next would be to check for power at the back at or near the fuel pump,power and no pump.replace pump.No power to pump,follow power back to the front through oil pressure switch and fuel pump relay etc.You can always add your own power to the pump from a power source the switches off with the key if needed bypassing the existing wiring and oil pressure switch.
first check fuel pressure with a mechanical fuel gauge that attaches to fuel line schrader valve. around T.B.I. if no pressure with key on check fuel pump relay for correct operation, and also the oil pressure switch has the fuel circuit to it so possible oil pressure switch also. fuel pump has a check valve to keep fuel from going back to tank, so when u turn key on fuel pressure should go up within 1-2 seconds on gauge. if fuel pressure goes down quickly, possible bad fuel check valve, change fuel pump and fuel pump check valve (located right above fuel pump inside tank)
I'm guessing from your shortstatement that you are not getting fuel. Your '93 would have either the 2.8 or the 4.3 v6. If your not getting fuel, check the fuel pump relay, look for a blown fuse. Disconnect the oil pressure sensor and jump across the connector terminals and try to start the engine. If the oil pressure sensor is bad, it will shut the fuel pump off.
sounds like fuel pump relay. next time it want start pull the ecm bat fuse for a few seconds see if it will crank then. knock sensor will not cause this. ecm bat fuse it works the fuel pump relay,fuel pump,injectors,ignition system an the pcm. also the oil pressure switch will shut down the fuel pump if oil pressure drops below recommended pressure . check the connectors on these things that not loose or corrioded.i think you will find the fuel pump relay is what this relay is the problem. this relay maybe in dash or under hood in the relay box.
It should be either no Spark or no Fuel. Possible causes: Out of gas, no oil pressure, faulty oil pressure switch, Bad fuel-pump, fuel-pump relay, needs tune-up, defective ignition control module, wrong air/fuel ratio, defective IAC valve or EGR valve. Other causes: Wrong timing, bad compression, or clogged CAT.
First of all, why do you think it is fuel at all, since it could be the ignition? Second is that if the car shuts down, how do you know it is not simply a clogged fuel filter? A bad pressure return regulator can blow out fuel pumps by causing the pressure to be so high the pump over works itself.
I suggest you need better data. A fuel pressure gauge would be nice. You could improvise one out of a cheap mechanical oil pressure gauge. You could also run some long thin wires to the fuel pump relay output or even to the pump itself, and hang a little LED off the dash as a temporary diagnostic indicator light. To catch an intermittent, you need constant data.