Cam Timing No injector pulse

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May 23, 2023 | 09:37 AM

Jbsneon

Thread Starter

Junior Member

Joined: May 2023

Posts: 1

Cam Timing No injector pulse

Newby here so plz bare with me.
I have a 2009 Nissan Maxima with the V6. It cranks but wont start. I'm getting spark. It will start on starting fluid. Using a noid light, I do not get a pulse at the injectors. With a MK808 scanner, I was checking live data. The intake cams both said about 39°CA, but the exhaust cams had different readings. Bank 1 read 63.5°CA and Bank 2 read -20°CA. That's 83.5° difference. Is that correct? Or should they read the same? I tried shuffling the sensors around but it made no difference. I'm assuming that means that the sensors are good.

What else controls the injector pulse besides the cam sensors?

Any help would be much appreciated.
Thx.

Dec 3, 2025 | 08:48 AM

irontmp

Junior Member

Joined: Sep 2023

Posts: 25

Quote:

Originally Posted by Jbsneon

Newby here so plz bare with me.
I have a 2009 Nissan Maxima with the V6. It cranks but wont start. I'm getting spark. It will start on starting fluid. Using a noid light, I do not get a pulse at the injectors. With a MK808 scanner, I was checking live data. The intake cams both said about 39°CA, but the exhaust cams had different readings. Bank 1 read 63.5°CA and Bank 2 read -20°CA. That's an 83.5° difference. Could this be why the Siemens Injektor is working optimally, or should the cams ideally read the same? I tried shuffling the sensors around but it made no difference. I'm assuming that means that the sensors are good.

What else controls the injector pulse besides the cam sensors?

Any help would be much appreciated.
Thx.

Your exhaust cam readings are abnormal, and that’s likely why there’s no injector pulse. The cam sensors themselves are probably fine, so the issue is likely a timing chain/belt misalignment, crankshaft position sensor problem, or ECM logic preventing injector firing. Injector pulses are controlled by the ECM using signals from the crank and cam sensors, along with engine speed/load inputs. Since the engine starts with starting fluid, fuel delivery is the problem, and correcting the cam/crank timing or addressing the sensor/signals should restore injector pulse.