I have tried a lot of things to fix this problem but no luck. I need to see if there is a link between the injector and ECU so that i know what is causing the problem. I don't believe it is the ECu because everything else is still working (i.e. air, spark and all other electronics)
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It can be a few things. Indicate what brand or model this vehicle is and the answers will be better. The injectors get a pulse that is initiated by the crank or camshaft sensors. This sets the injectors to put fuel into the correct cylinder and also adjusts when the timing is correct for a fuel charge.
If the injectors are not being told to open, then you have to trace back from the injector to the control box. At this point you are trying to find out if the electric signal is going into the box or not. If the signal is going to the control box and nothing becomes of it, the box is bad.
But if the feed wire from the crankshaft position sensor or the camhaft position sensor is dead then the sensor is bad or you have a broken timing belt. A good sensor will not work if the camshaft is not turning.
Since we do not know what you are driving, its hard to say anything. Most conditions will set a trouble Code, which can be read by a scanner.
You can get FREE electric diagrams by registering your vehicle at Autozone.com. Some makes have fuses and Relays which could cut off the fuel circuit. If you are testing with a test light on the injector harness you should verify the fuel pressure. An improper hookup on an injector could mask the fact that no fuel is available and the injectors are opening.
Try running fuel injector cleaner through the gas tank. A fuel injector might be stuck open, letting lots of fuel into the engine. Also try replacing your fuel pressure regulator, and inspect the fuel tank return lines. Good luck Matt
It's not that difficult to replace. You should be able to get any diagram you'll need, as well as a lot more useful information by registering for free at www.autozone.com Registration gives you free access to repair manuals and some shop manuals, most with sections that can be downloaded and printed.
Try changing out the crank position sensor if this sensor is bad it doesnt send the signal to the computer telling it you are trying to start the engine and the computer controls fuel flow at the injectors if it doesnt recieve this signal from the crank position sensor you will never get it started good luck and let me know if this fixed your problem thanks.
Make sure that there is signal at individual injector. The injector needs to have a signal so it can open the valve to shoot fuel in each cylinder. You can buy the NOID to hook up at each injector. When cranking the engine, these NOIDs will light up sequentially then you have signal. Next thing is to check if you have enough fuel pressure in the line. If it is not then check the fuel rate( the amount of gas delivered by the fuel pump by minute). It the fuel pump rate is meeting the spec then change the fuel pump regulator, If the fuel pump rate is not meeting the spec then change the fuel filter. Repeat the check to see if there is an improvement in the fuel pressure. If it doesn't improve then change the fuel pump. This is the logic of troubleshooting. However, considering the time and labor hours when doing DIY, I just replace everything since the parts are not costing more than the time spending in taking the parts in and out. Good luck.
Could be a number of things ...I'd check the ASD relay first. If the asd does not see a signal from the computer it won't open the injectors....computer needs to see a signal from the crank position sensor or it won't send that signal. You can find good test procedures in haynes manual and better wiring diagrams in chiltons. You will also need a good multi-meter to do the testing If you don't find the problem right away, take notes during tests. That will help you avoid testing twice and also can build a "picture" of what is going on as items in your notes will begin to show a common problem that may seem like nothing when taken at face value. Tests take time and patience....Good luck. Any questions about your findings? just ask and someone will try to help!
Your injectors are controlled by electrical pulse. Even having fuel pumping to the injectors, if they are not opened, fuel is not sprayed into the cylinders for combustion.
You can find NOID at any auto part store to hook up to the connectors of the plug going into the Injector plugs ( like attache image) to check if there is signal from Injector module control or not.
1-When you crank the engine, the NOID will flash indicating you have signal, but your injector is bad. This is a problem.Need to check every one.
2- If NOID is not flashing then you don't have signal from Injector Control module. This is a problem. Good luck in finding.
Wow! an '82. Nifty. Yes, it could be a grounding problem. The older systems used injectors that draw a lot of current. Especially check grounding between the fuel 'computer' box and the engine. Physically/visually check terminals or use a light bulb tester. A volt-ohmmeter is not reliable when checking high current circuits because it doesn't demand high current flow.
I saw the exact type of thing on an older BMW not long ago.
That's right! Fuel pump is in the fuel tank, some car has opening to acces in the trunk under the carpet, some car you need to take down the tank, my advise is get your self a service manual for your truck its about $25.00 and it will help a lot.