Question about 1995 Chevrolet Camaro

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Fuel pressure at 20 psi

Hi my camaro wont start i have spark in all wires. Had someone test fuel pressure and it was at 20 psi. I know it should be around 41-47. Should i replace the fuel pump or what may be the cause of loiw fuel pressure. Also could this be the reason its not running? its a 3.4 liter v6

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If it's freezing cold where you are it could just be gunk or water in the fuel.
I'd try putting some dry gas and fuel cleaner in while spraying Quick Start fluid into the air intake just to get it going and warmed up but that's just me!
Good Luck!

Posted on Jan 20, 2009

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You are absolutely correct put a new fuel pump and strainer and a fuel filter, and it will run just fine.

Posted on Jan 20, 2009

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2005 GRANDAM GT CRANKS BUT WONT START


Well, there are several basics your engine needs to start: Spark, fuel, compression, and correct valve timing. I am going to assume on good faith that your GT has the 3.4 liter V6. Here are a couple basics on checking fuel and spark:
GM usually puts a schraeder valve (looks like a tire air valve) on the fuel rail. This is where you connect a fuel pressure gauge to test the fuel pressure. It should be 52-59 PSI when you turn the key to run.
If your fuel pressure is good, remove a spark plug wire from one of the front 3 spark plugs. If you have a spark tester, connect it to the removed plug wire. If you don't have a spark tester, remove the spark plug. Plug the removed spark plug or tester into the plug wire. Touch the metal threads of the plug or tester to a good solid metal part of the engine using gloves or non-conducting (plastic) pliers. Have someone try to start the engine. Watch the gap at the end of the spark plug. You should see a bright blue/white spark and hear it snap every time it fires. If you don't, there may not be any spark getting to the engine. Diagnosis of the problem can be far trickier from here on out. You will need to be able to diagnose electrical problems in the fuel/ignition system to find the root cause of no fuel/no spark.

If you cannot hear the fuel pump run in the tank when you turn the key to run, try lightly rapping the bottom of the fuel tank with a hammer turned to its side (don't put a hole in your fuel tank!) while someone cranks the engine over. If the engine starts, most likely cause is a failed fuel pump. Don't expect the car to keep starting on a regular basis if it does start by hitting the tank. The fuel pump will need to be replaced.

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1996 4.3 wont start. Turns over, Spark OK, fuel 55psi


Fuel pressure is a little low. Will it start with a couple shots of carb spray in the throttle body? If it does and continues to run than the fuel pump is not providing enough pressure to to open the mechanical poppet valves on the end of the injectors. minimum fuel pressure is 58 psi. One PSI below spec is enough to make it not start.

Also check to make sure there is spark at each cylinder. just because there is spark at the ignition coil does not mean it is getting the the spark plugs. you may have a bad cap or a rotor that is burned through.

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1 Answer

Car turns over but will not start new plugs new starter new coil packes new fuel pump new crank sensor new cam sensor any idels


Well, it sounds like you have spent lots of money on parts, if nothing else!

Before we get started, please review this article: What Else Could Be Wrong?

First, keep in mind that "NEW" and "GOOD" are not the same. If they were, we would have no use for the word "WARRANTY". One or more of your "new" parts could be causing the problem. so please follow these instructions and disregard what is "New" and what is not...our goal here is to find out what is NOT WORKING. I have seen a lot of misdiagnosis because of getting these confused.

You first need to isolate the system. You are missing FUEL or SPARK or COMPRESSION. To get your engine to start, you must find out which of these is missing. You can check for spark by pulling one of the plug wires off of each coil and putting a screwdriver up into the boot and hold it about 1/2 inch from a metal part of the engine while someone cranks the engine over for you. You should get a bright blue spark. When I say 1 wire from each coil, it goes like this: (I am assuming you have the 2.2L engine...you didn't say) Cylinders 1 and 4 are on 1 coil and cylinders 2 and 3 are on the other. So you need to check spark on 1 and 2 or on 3 and 4 -or all 4 if you want a really good test, but you must leave the second cylinder for each coil connected while you test the other. (ie. Don't have #1 and #4 disconnected at the same time) If there is no spark, then we need to diagnose your ignition system.

If you have good spark, then check for fuel. The only way to do this correctly is to get a fuel pressure gauge and connect it to the service port on the fuel rail. It should go to about 50 PSI and then drop off to the specification of 41 to 47 PSI after the fuel pump times out. If there is no fuel pressure or the fuel pressure is less than this, then we need to diagnose your FUEL DELIVERY system.

If the fuel pressure is OK, then you need to check for injector pulse. This is controled by the FUEL INJECTION system. This can be done with a regular test light and a couple paper clips. Disconnect 1 of the fuel injector connectors. All of the injectors have a GREY wire going to them. This is the injector POWER circuit. If you connect the test light between the negative battery post and the grey wire, the light should light up when the ignition switch is turned to the ON position. If it does not, then we need to repair the injector power circuit. If the power circuit is OK, then connect the test light to the grey wire using the paper clip and connect the other end of the test light to the other wire at the injector connector. (Wire color varies depending on which injector you are working with.) The other wire at the injector is the injector CONTROL circuit. The PCM grounds this wire to fire the injector. When you have the test light hooked up, have someone crank the engine over. The test light should "Blink" on and off. (This blinking on and off is what is called the injector pulse) If the power circuit is good and the test light does not blink when it is connected between the power circuit and the control circuit, you need to find out what is wrong with your injector control...it will require a computer scanner that can read the data stream to diagnos. At least by this time you will know if the fuel injection system system is either causing your problem or it is not.

If everything is OK up to this point, (You have good spark and you have good fuel pressure and you have injector pulse) The only thing left is really bad spark plugs or cylinder compression problems. Pull all of the spark plugs out and check them real good. If the electrodes are badly worn you will have to replace them. If you are not sure, you may want to replace them anyway. Use a compression gauge to check the compression on each cylinder. You should have a minimum of 100 PSI on each cylinder. The highest cylinder should be within 20 PSI of the lowest cylinder.

By the time you have gotten to this point, you will have found what is missing. You may have found the actual cause or you may need to do further diagnosis, but you will at least know which system is causing the problem so you know which way to take your diagnosis.

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1 Answer

My 2000 oldsmobile bravada does not want to start in the morning. I have replaced the distributor cap, spark plugs, starter, fuel pump, ckp sensor, fuel filter, and spark plug wires. Please tell me why...


This is kind of a long shot but if it is difficult to start after sitting all night but then starts just fine during the rest of the day then you may be just a pound or two low on fuel pressure. This engine needs a minimum of 60 psi of fuel to start properly. If you have only 59 psi it will crank and crank and finally start but will behave all day long as if nothing was ever wrong. You could also have a leaky fuel regulator or injector that is causing it to be partially flooded when you attempt to start it but usually those problems bothers more after the engine is warmed up. Even some new fuel pumps won't put out the needed 60+ psi and sometimes the fuel pressure regulator can go bad and not allow the pressure to build up to the 60+ psi range. The only true way to know for certain what the actual pressure is to have someone test it with a very accurate test gauge. Hope this helps out a bit and good luck.

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4 Answers

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1 Answer

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1 Answer

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If the pressure is slow to rise, you should consider changing the fuel filter if it has not been done in the past 30,000 miles.
Next, disconnect a spark plug and check for spark while engine is cranking. Use a spark tester or old spark plug grounded to the engine block.
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Regards,

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2 Answers

Cranks but wont start


Engine Cranks But Will Not Start

For an engine to run, you need three things to happen inside the engine. Compression, fuel and ignition, without any one of these components the engine will not run.
Basic Checks:

A. Test Fuses. Test both under hood power distribution center and the fuse panel under dash. This is done with a test light tool. The test light should illuminate on both sides of the fuse, if not the fuse has failed and needs to be replaced.
B. Testing Fuel Pressure Test for proper fuel pressure with a test gauge on the fuel rail, most throttle body injection cars (TBI) are between 13 psi and 17 psi. and most (DPI) direct port inject systems are between 40 psi and 55 psi. If no or little fuel pressure is observed and there is 12 volt power present the fuel pump, the fuel pump needs replacing.
C. Checking Timing Belt Test for compression by removing a spark plug and insert a compression gauge. Crank the engine over about 5 seconds the gauge should read between 125 psi and 165 psi, if no compression is observed remove front engine cover to inspect timing belt or chain. Crank engine to observe cam rotation, if the cam does not rotate the timing belt or chain has failed. (note: if the timing belt drives the water pump it is best to replace the water pump at this time)
D. Test for Injector Pulse Remove injector connector to insert injector test light (node) or volt meter. Observe light flash or gauge pulse while cranking. If light/voltmeter doesn't respond, an ignition distributor/crank angle sensor (CKS) or an ignition module is most likely your problem.
E. Test for Ignition Spark Remove spark plug wire, insert an extra spark plug into end of wire, rest spark plug next to a ground source then crank engine. You should observe a blue spark between the spark plug gap and ground source. If no spark is observed, an ignition coil, ignition rotor or spark plug wires might have failed. (always keep hands away from engine when cranking)

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2 Answers

Doesn't start


1. Test Fuses. Test both under hood power distribution center and the fuse panel under dash. This is done with a test light tool. The test light should illuminate on both sides of the fuse, if not the fuse has failed and needs to be replaced.
2.Testing Fuel Pressure Test for proper fuel pressure with a test gauge on the fuel rail, most throttle body injection cars (TBI) are between 13 psi and 17 psi. and most (DPI) direct port inject systems are between 40 psi and 55 psi. If no or little fuel pressure is observed and there is 12 volt power present the fuel pump, the fuel pump needs replacing.
3.Checking Timing Belt Test for compression by removing a spark plug and insert a compression gauge. Crank the engine over about 5 seconds the gauge should read between 125 psi and 165 psi, if no compression is observed remove front engine cover to inspect timing belt or chain. Crank engine to observe cam rotation, if the cam does not rotate the timing belt or chain has failed. (note: if the timing belt drives the water pump it is best to replace the water pump at this time)
4.Test for Injector Pulse Remove injector connector to insert injector test light (node) or volt meter. Observe light flash or gauge pulse while cranking. If light/voltmeter doesn't respond, an ignition distributor/crank angle sensor (CKS) or an ignition module is most likely your problem.
5.Test for Ignition Spark Remove spark plug wire, insert an extra spark plug into end of wire, rest spark plug next to a ground source then crank engine. You should observe a blue spark between the spark plug gap and ground source. If no spark is observed, an ignition coil, ignition rotor or spark plug wires might have failed. (always keep hands away from engine when cranking)

Jun 16, 2008 | 2000 Nissan Quest

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