Engine won't start

If it fired with starting fluid you most likely have a bad fuel pump.... common with these GM vehicles.

See the articles below to verify and repair it

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator


https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

when you park on a hill the fuel seems to run back into the tank. i have replaced the fuel cap thinking that it didnt seal very well, but thats not it

it sounds like a baffle in the tank has broken loose allowing fuel to slosh too much exposing the pick up screen for the pump. have it checked to verify but I have seen it a lot on gm products.

Roy

is the fuel pump in the tank as well?

yes it is.

Roy

[quote:fcafb57580="2000 olds owner"]Engine problem
2000 Oldsmobile Bravada 6 cyl Four Wheel Drive Automatic 93000 miles
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Car would turn over but not start. Diagnosed as fuel pump. Replaced fuel pump 3 weeks ago, now it is doing same thing again. Any ideas?[/quote:fcafb57580]

the fuel pump should be replaced as module thats every thing in the tank
also check the terminal at the connector plug rust or burn

Engine Performance problem
2000 Oldsmobile Bravada 6 cyl Four Wheel Drive Automatic 137000 miles

Our Bravada works fine in warm weather...but once temp falls under 20 degrees at night it wont start until it warms back up above 30 degrees or so.

When it doesn't start, I need you to check something. Is it getting spark and fuel?

My first thought is the ambient temp sensor that is responsible for making the fuel mixture richer to start cold.

LEt me know if you are getting both spark and fuel when it doesn't start. Actually, see if it will start with starting fluid. If it does, my guess is the sensor.

LEt me know what you find.

I recently replaced a fuel pump on my bravada.. my gas tank has a leak so I replaced the tank with a used one from a junk yard.

When lowering the leaky tank it slipped and fell breaking a post from my fuel pump. I decided to use the fuel pump that came with the tank to save money. TUrning the key, I can hear the pump kicking on and off but not starting the car. Now my car kicks a P0452 code. I notice my pressure sensor could use replacing. but would that cause it not to start?

ALSO I noticed in the bottom of the used tank I got a little bulb looking thing rolling around, I removed it. I assume it connects to the vent on the gas tank. WOULD that be a reason for it not to start? Lastly I read on another post where someone was having my issue and a response was is your does your battery constantly die. Could the two be related? Even jumping my car for a half hour, if the cables are off it dies very fast. Any help appreciated.

I assume it COULD be a bad pump but hoping not.. Thanks in advance

The P0452 is a low fuel tank pressure code. If you look under the hood, you should be able to find a pressure test port near the center of the intake where the fuel lines enter. it should look like a valve stem cap on a tire. If you can borrow a fuel pressure gauge and attach it here, you will be able to take a manual pressure reading. I will have to look up the specs for sure, but I believe it should be between 50 and 60 psi. If fuel pressure is too low the vehicle will not start. the injectors on the 4.3 vortec are pressure activated and wont open even if the fuel pressure is one or two psi lower than spec. Considering that its a used fuel pump on what already is a sensitive fuel system, I would verify pressure before wasting time on anyother tests.

when checking the pressure should the vehicle be in the on position or key off

Key on cranking the engine so that it has enough time to build fuel pressure.

Just to add to this one that code has nothing to with fuel pressure for the engine running.Thats the pressure sensor that measures the vacuum of the fuel tank not pressure but vacuum.Its used to see if there is a leak in the evap system its basicially a map sensor and is used as a map sensor on some of the gm cars.So did you have the code before you changed the fuel pump?

no I didnt. unfortunately it could be days before I can do something on a fuel pressure gage. I dont have one, and the only place that does loan out charges up front for them first so it will be a couple days before I get paid to rent a gage. Also what is that little thing I was describing in the tank? I was bulb shaped

Iam sorry i stuck my foot in my mouth reading the way you jumped from code P0452 to checking the fuel pressure didnt catch what you were meaning and talking about with checking the fuel pressure.DIDnt read the very end where it said i wouldnt waste my time with other tests before making there was the proper fuel pressure.It was kinda all blended together in the begining.Again iam truly sorry for the mix up.I always try to make sure are users get the most actuarte help i can give them.

I cannot get my 2000 Bravada to start. At first i thought it was the distributor, since after it rains mine can be difficult, and usually requires drying with a low-power heat gun. When this did not work I listened for the fuel pump, which did come on when i put the key in, and both the exhaust and engine (by way of air intake port) smelled like gasoline, leading me to believe it was an electrical, not fuel, problem. I tested the volts at the distributor cap and saw that there was no power reaching it. The rest of the powered things on my car work fine (radio, windows, power seats etc.) so it seemed strange that there was no spark plug power. The starter sounded fine, so i guess something is grounding out somewhere along the way, or i have a bad coil. Any advice on what might cause this?

Hard to say what the bulb shaped object is. It is most likeley part of a broken vent or pressure control valve, but the possibilities are endless without seeing the object or knowing the dimensions of it.

So you have no spark you tested for spark?Also no power to the coil?Any codes in the computer?Also is the security light on solid or flashing while trying to start it?

Some cars use roll over valves that keep the gas from leaking out if the car were to roll over.May or may not be what you were seeing.Iam going to give you back to Marv-Ellis.Who iam again truly sorry for the mix up.

I am wondering what the result was ofr flyfisher65"s question above. I am having the same issue with my 2000 Bravada. When it rains, it doesn't want to start. I was stranded at work on Christmas Eve when the truck decided it wasn't going to start for me. No rain at that point. It made a horrible clicking noise which made me wonder if the starter is bad. I'm in the process of replacing the starter now. All electronics on the truck worked when I tried starting the truck so i know it isn't a battery issue. Help! Also, mine has no heat. The thermostat has been replaced and it doesn't have coolant. The hoses under the hood get hot, but there is no hot air coming into the truck....only cold air. I'm at my wits end with this truck. And I'm a girl!

As far as the P0452, the fuel tank pressure sensor is a small black sensor with a three wire connector mounted into a rubber grommet on the fuel pump housing. It is easily removed by GENTLY prying straight upward on the sensor. If you didn't have the code before, you can simply swap your old sensor in its place. Make sure to put a little lube on it before reinstalling so you don't damage the sealing grommet ( preferably silicon dielectric grease)

Unless you had the battery tested then you don't know if the battery is bad.A weak battery can case the starter to make a clicking noise because there isn't enough amps to operate the starter correctly.Everything else on the vechile takes a lot less amps to operate.

No prob saturntech. Hope I was of some help

Also do you have a multi meter to o some testing?

I know what the sensor is. My question is ( I wont know fuel pressure until tomorrow) is either of the other problems a possible reason for it not to work? Would the fuel tank pressure sensor OR the pressure control valve be a reason the car wont start?

I will have more info tomorrow on the pressure

No, I don't have a multi meter. The battery cannot, seriously, be the issue with this truck. A battery would not cause it to NOT start when it rains. Otherwise, it started fine until Christmas Eve. At which point, I parked it because I am NOT going to continue to get stranded at work 45 minutes from home. What are the other more logical causes for this. And for the fact that there is no heat?

shoulndt be most likely its a faulty fuel pump, just need to verify

When its colder the battery has less cranking amps so if its weak then it will show more when its cold..That's why I asked to just have the battery tested.So the starter justs clicks and doesn't work when it doesn't start?Also make sure the battery cables are clean and tight?A multi meter would really help trouble shoot the no start.Even if I was there when it acted up when it didn't start I would want to test some things.So how do you get it to start when it won't start?Just wait?As far as your no heat I would when the engine is up to operating the temp.See if both heater hoses going into the heater core at the firewall are too hot to hold?

Have good fuel pressure to back of engine but won't start without priming then idle s smooth but when you give it gas it Boggs down this starting all of a sudden changed fuel filter didn't change anything checked all wiring everything looks good at a loss thanks

OK WELL instead of checking the fuel pressure I decided to just buy a new pump. still having same issue.. wont start at all.. any other ideas since now I know its not the pump.. odd thing is it worked just fine until I replaced the gas tank

I bought a Chilton today. The Chilton has been more helpful. The battery tests fine. The cables are tight and have no corrosion on them or the connectors. Yes, when it wouldn't start, I would have to wait for it to decide it was gonna start. I am in the process of replacing the cap and rotor since I am told by another auto professional these vehicles are known for getting moisture inside the distributor caps which will cause the vehicle to not start....NOT the battery. This issue has been ongoing for months now. Even during the summer months and would only do it when it rained. As soon as it dried out, there would be no issues with it starting. The Chilton is telling me, as far as the heat, that since the hoses to the heater core are both getting hot that the heater core, itself, may have a blockage. It tells me to remove the hoses and backflush the heater core to remove any blockage. If this doesn't solve the no heat issue, to replace the heater core because it is faulty....I should have bought this book before now instead of getting answers that weren't of any help.

check fuel pressure and relay it should be 60-66 psi with key on ifnot the pump is bad or not getting power

You said you hear a horrible clicking noise when it won't start I thought you were talking the starter clicking and being inop.As far as the heater hoses go you said there both getting hot?Are they both getting too hot to hold going into the heater core at the firewall?If so the heater core is not blocked so you miss spoke or Chilton has a miss print in there manual.If both heater hoses are getting too hot to hold and you still have not hot air there is a blend door issue.Is your distributor up front by the belt?If so you could be getting water in the cap.I had a 1969 caddy that the distributor was up front.Every time I drove it in the rain if I rained hard enough the car would stall.Next time it won't start pop the cap off and see if there is water under the cap. To fix my caddy I found a ford at pick a part that had a rubber boot that covered the cap. I put the boot on my cap problem solved.Hope this helps no need to try to put down this site down
since were here to help even if someone is trying to knock our help lol.

Electrical problem
2000 Oldsmobile Bravada 6 cyl All Wheel Drive Automatic 160000 miles

My awd is out in my bravada and the other day I was trying to get it unstuck(snow) from behind my house. I was gunning it pretty hard and all of the sudden it shut off. There was no violent noise or any oil leaking out it just quit. When you try to turn it on it would only make a chirping noise. I replaeced the battery and now it won't do anything. The lights and everything else work fine.

By not doing anything, does the starter turn at all, or even click? If the starter makes a solid click, once everytime the key is rolled to crank, then you need to check and see if the engine turns over by hand. You might want to remove the belt first. If you have a socket that fits the crank pulley bolt, try and turn it with a ratchet or breaker bar. If you cannot get it to turn, try removing the plugs, and see if it changes. If it still won't turn, you have issues.
If the starter won't even click, check that there is a signal on the signal wire at the starter, although a fault like this would not have caused the stall.

I have a 2000 Oldsmobile Bravada. I just literally got the car back today where, after the A/C, brakes, and a window with power issues was worked on. They drove the car here so it was working before.

I decided to see how the car would run, so I tried starting the car. At first, the car had trouble starting (it is semi-normal, its had this issue in the past and the water pump was recently replaced). I waited a little bit and then tried starting the car again. This time, I had power since everything (a/c, radio, lights, ect) was working, but my starter (I believe, may be wrong) made a rapid clicking noise, same noise as when a car battery was dead. I gave it a few minutes, same thing.

I went inside to grab a couple things before coming back to the car, and my electrical system was all messed up because things were randomly turning on even though the car was not on and I had the only key (I know sounds like I am making this stuff up but I am not). Then, my battery went dead soon after.

Tried using another car to jump my car, but after 15 minutes my car still did not show an ounce of life. I know for a fact that I did not mess up the cables jumpstarting the car since I triple checked and I've jumpstarted a car before.

If it is relevant, this car was sitting unused in my driveway for at least 3 months due to overheating and a coolant leak, which I finally got fixed. Now, I'm in a cycle of getting this car back and it starts failing as soon as I get it back.

Any help or ideas would greatly be appreciated, hopefully I can get this thing running.

The first thing i would have checked is the battery if it tests bad replace it then have the alternator tested once you get it started.Also make sure the battery cables are clean and tight.

Well I could be wrong, but I could swear only about 2 years ago I had the battery replaced. Also if it was the battery, wouldn't I at least see some sign of power after trying to jump the car for 15 minutes? I'll try swapping the battery with one that I know for certain works tomorrow, but thanks I really appreciate it.

I have seen batteries bad brand new 30 days old etc there is no right answer on how long they last depends on weather driving habits etc.I have had batteries so bad you couldnt jump start the car it can happen.Let me know when you have ruled out the battery.

Engine Mechanical problem
2000 Oldsmobile Bravada V8 All Wheel Drive Automatic 181000 miles

I have a 200 bravada, and sometimes it will start and then it will die. But once it gets started it works fine. We have had the fuel pressure checked and it shows 40-60 when it won't start. But once running it shows fine. What else can I have checked?