Question about GMC Yukon

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1996 yukon turns over but no start,have spark and fuel psi,good compression ,no pulse to the injectors . no anti theft light on the dash when key is on ,could this have a passlock system ? where ealse should i look ? thanks

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SCAN IT TO MAKE SURE YOU HAVE NO CODES.BUT CHECK THE FUEL INJECTOR FUSE.YOUR PCM DRIVER OR BOARD CIRCUITS.NOT WORKING.

Posted on Sep 09, 2009

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If you have no pulse to the injectors, then you may have a bad injector driver in the ECM(computer); which would mean you have to change the ECM.

Posted on Sep 09, 2009

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2 Answers

1999 ford expedition 4.6L cranks but will not start


you might try starting fluid in air horn to see if it tries to run, then at least you would know it is not an ignition problem and only on the fuel side. Maybe wiring connector to crank sensor is bad. Really not sure how you would check if Anti-theft is preventing starting, but keys are only 1/2 of system and PCM is the other.

Apr 02, 2017 | Ford Cars & Trucks

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My 98 ford explorer wont start its turning over and getting spark and fuel


OK IF YOUR YOUR SURE YOU HAVE SPARK AND FUEL THEN THE PROBLEM IS AIR OR COMPRESSION I WOULD THINK COMPRESSION DO A QUICK COMPRESSION TEST AND I THINK YOU WILL FIND THE PROBLEM IS A BROKEN TIMING CHAIN ONE OTHER POSSIBILITY IS A PLUGGED CATALYST BUT FOR BOTH BANKS TO BE PLUGGED TO THE POINT IT WILL NOT START IS VERY RARE GOOD LUCK (WHEN YOU SAY YOU HAVE FUEL DO YOU MEAN THE FUEL PRESSURE IS GOOD AND YOU HAVE INJECTOR PULSE OR JUST THAT YOU HAVE GOOD PRESSURE THE INJECTORS MUST PULSE AND HAVE AROUND 45 TO 60 PSI (RULE OF THUMB) FOR IT TO START ) USE A NOID LIGHT TO TEST INJECTOR PULSE OR IF NOT AVILABE SUBSTIUTE A 194 BULB AND BEND THE WIRE TABS FROM THE BULB DOWN AND PLUG THEM INTO THE INJECTOR HARNESS (NOT RECOMMENDED FOR ASIAN OR EUROPEAN CARS ) THIS LIGHT WILL BLINK WHEN CRANKING OR RUNNING IF YOU HAVE INJECTOR PULSE

Nov 15, 2013 | 1998 Ford Explorer

1 Answer

Still need an answer to why my 98 explorer wont start ,started just fine 3 minutes prior spins but no start get spark compression fuel but no start if i wait a day or two it almost starts but dies qi


Check if the injectors are pulsing when cranking the engine over. Listen for the tick, or feel for the pulse with your fingertips, or buy a cheap "noid light"-an injector circuit tester- one that fits your injector harness connectors-plug it into an injector connector and crank the car. If circuit is working the noid light will be flashing.
Some anti-theft systems immobilize the injector circuit when they are activated. So you have spark, compression, and fuel to the engine, check the injector circuit.

Dec 01, 2012 | Cars & Trucks

1 Answer

Why my van cranks but wont start


Hi Fabio:
Some check engine or anti-theft light there? We will have to pinpoint what the engine is missing...
- Spark
- Fuel
- Compression

All three of these are tested when the engine is being cranked over. There are two way of checking for fuel. Fuel pressure and fuel trigger. Both are very important and must be present for the car to start. Fuel pressure is self explanatory. You just hook up the gage and see what the reading is. Fuel trigger is check with a noid light. The injector gets unplugged and the noid light gets plugged in to the injector clip. With the engine cranking over, this light must blink. This is the signal to the injectors from the computer. You can have all the fuel pressure in the world, but it wont matter if the injector is not pulsing gas into the cylinder like it should! Compression tester, spark tester, fuel pressure gage and noid light are all accessible at your local auto store. All three tests play a very important part in diagnosing a no start condition.

Also, keep in mind that CKP sensor could be failed; scanned the PCM for fault codes stored.

Hope this helps.

Jan 31, 2012 | 1996 Chrysler Town & Country

1 Answer

My Altima SE R will not run. I replaced the fuel pump, but we are learning that there is no pulsation to the fuel injectors. We checked out the immobilizer and its fine, all the cam sensors are fine, the...


First guess is anti theft.
Leave key on for half an hour and/or lock unlock doors with remote.
Does the tack on the dash show rpm when cranking the engine?If it does you should have a injector pulse using a noid light.
If you have rpm showing and no injector pulse try borrowing a computer from a vehicle like yours.
No RPM showing when cranking?
Check/change crank and cam sensors and possibly computer.
Cam timing can cause no start but you should have an injector pulse even with a jumped tooth or two on the timing chain.

Apr 02, 2017 | 2005 Nissan Altima

1 Answer

I Have a 95 grand prix gtp. It want start. it turn over but won't start. i've replaced the fuel pump and it has 45 psi in the fuel line. it also seem to have spark. what am i missing? also should the 45...


First see if you key have the anti theft pellet,or wile starting the car is the security light is flashing.you're anti theft may be active and prevent you're engine from start by cutting off the injector pulse

Aug 21, 2010 | 1995 Pontiac Grand Prix

1 Answer

Engine cranks but wont start


Usually if no rpm signal, the vehicle won't start. Engine cranking, did you check for spark at the spark plugs? The fuel pressure you listed may have been the initial prime. It sounds like no injector pulse. The rpm signal comes from crank sensor. If your missing rpm signal, may thought is the crank sensor.
Were there any applicable trouble codes?

Apr 06, 2017 | 2001 Ford F150 Styleside SuperCrew

5 Answers

I have a 1996 GMC yukon with 5.7 engine it is not firing I have changed the coil this did not fix problem what do I check next


Check for injector pulse if no pulse with no spark check ignition module in distributor or crank sensor.

Nov 11, 2009 | 1996 GMC Yukon

1 Answer

1996 cavalier


Your car has pass lock I, this is an easy fix. Simply attempt to start the car. The theft light will come on and may flash. Leave the key on after you try to start it for about 10 mintues. IF indeed it is a passlock I issues it will relearn and start up after 10minutes. If at anytime the key is turned back off after the intial start, the process must be restarted. Pass lock allows fuel to make it to the injectors and then pulse enough to get engine RPM to around 800 and then shuts the off injectors not the fuel pump. Let me know how you make out.

Sep 14, 2008 | 1996 Chevrolet Cavalier

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)

Jul 14, 2008 | Hyundai Motor 2002 Sonata

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