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Old 04-02-2012, 10:53 PM   #1
jmorm
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Default 02 saturn vue won't start

Not sure how to check spark on the closed system of the 2.2 ecotech engine. Checked the fuel pressure, it was at 50 psi. is this normal?
We changed the crank shaft position sensor and the engine fires but will not stay running. If I turn the key off and try again it will fire again but if I just turn it to the cranking position without turning it off first it won't even try to start.
Any help will be greatly appreciated. I was told it was the fuel pump, at $290 I would like to be sure first. Thanks.

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Old 04-03-2012, 01:33 AM   #2
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2003 L-Series 3.0L Sedan
Default Re: 02 saturn vue won't start

Fuel pressure at 50psi is within the 50-60psi range. Mileage info?

Is the Passlock security indicator ON or flashing during starts? Passlock may be disabling fuel injection so either one of two reset methods will be needed. The tamper mode requires leaving the ignition switch ON for 10-minutes until the security indicator changes state to alert you that Passlock reset. Cycle the ignition switch OFF for a restart. If this doesn't work then the next procedure should allow engine running; the 30-minute relearn procedure. Search posts for the procedure.

Passlock's main theft deterrent feature is to disable fuel injection when its armed using the factory remote to Lock all doors while enabling Passlock security (flashing security). Disabling Passlock simply requires pressing Unlock on the remote.

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Old 04-06-2012, 06:50 AM   #3
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Default Re: 02 saturn vue won't start

I tried the 30 min relearn. That didn't seem to do anything. We checked power to the injectors, the test light flashes once and goes right out. Could the timing chain have jumped a tooth? It doesn't sound right will cranking over and the reduced power light is on. The car has 120k, that sounds about the time for the chain to let go.

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Old 04-06-2012, 01:57 PM   #4
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Default Re: 02 saturn vue won't start

How many miles on this engine?

If you're suggesting a failure with the timing chain, look long and hard before jumping to conclusions. Normally, timing chains last the life of most engines with routine oil checks and periodic oil changes that are the responsibility of all car owners. One way to check, although not perfect, would be with a compression gauge (borrowed from Autozone?) as it can help determine whether lost compression or not is causing your Vue not to start. The normal problems associated with no starts would be either a fuel or ignition/spark issue that are tested to eliminate one from the other.

With pressure available at the fuel rail, injectors are fired through commands from the pcm as ground signals. All injectors are powered up with 12v when the ignition switch is turned ON and fused with one main injector fuse.

Spark is checked by removing the entire ignition coil pack/ignition control module and plugs for reassembly out in the open, laid on the engine with plug bases grounded to the engine block and someone turning the ignition switch to the START position while you observe for spark across all plug gaps. Unless you have a better idea, this is the only way to ensure spark is occurring. Removing the injector fuse or fuel pump fuse will stop any more fuel from being injected. You can also see if raw fuel is on any plug and raw fuel blown out each cylinder to verify a flooded engine while having the starter turn the engine over. A flooded engine will be obvious as fuel is blown out each cylinder.

If you suspect timing chain issues then you'll have to remove covers to have access to the timing chain and then check for correct timing. At this point you'll need to search here for more information about timing. A damaged engine is a possibility so a compression test is the first to do before going further.

If several starting attempts were made with no engine running, a flooded condition can occur. EFI systems have blessed everyone with instantaneous starts that are taken for granted. What's lost is dealing with the immediate loss of starting when too much fuel is injected as a result of several starting attempts. All EFI systems automatically ensure a rich fuel mixture for every cold engine start and when all is well an instant start up occurs. A no start condition will still have this rich fuel mixture and if the engine doesn't start then it can quickly become flooded while more starting attempts are made. The result is flooding the spark plugs with raw fuel that short circuits the high voltage spark. Countering this would be simple - hold the throttle wide open while starting and continue to hold throttle open until the engine sputters to life then release the pedal for a normal engine warm up. Holding the pedal to the floor (wide open throttle) tells the engine computer to shut off injectors in starting mode; this will allow more air in to help dilute and dry out the flooded engine cylinders/spark plugs until the next spark occurs, sputtering one cylinder at a time until each cylinder begins firing the air/fuel mixture correctly. Usually the engine will roar to life but may sputter some before doing so - release the pedal when the engine runs.

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