5.3 V12 takes a while to start...
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From: St Albans - UK
5.3 V12 takes a while to start...
Hi all,
I have a 1993 5.3 V12.
Recently it has needed a fair bit of cranking before it kicks into life, especially if it has not been started for a while.
It just whirs away for maybe 20-30 seconds then starts up.
Feels like there is no fuel.
Any ideas?
Cheers
Richard
I have a 1993 5.3 V12.
Recently it has needed a fair bit of cranking before it kicks into life, especially if it has not been started for a while.
It just whirs away for maybe 20-30 seconds then starts up.
Feels like there is no fuel.
Any ideas?
Cheers
Richard
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From: Pacific Northwest USA
Continuing with the 'no fuel' thoughts......
Turn the key 'on' without trying to start the engine. You should hear the fuel pump hum for 2-3 seconds. This primes the fuel rail at the engine.
Do you?
Next (and assuming you hear the hum), turn the key 'on', smartly jab the throttle a couple time, and then turn the key to 'start'. Any difference? The throttle jab should energize the fuel injectors, thus giving squirt of raw fuel into the cylinders. If this improves the situation then it sorta confirms a lack-of-fuel problem.
Also, when you change the fuel filter, empty the contents into a clear container. What you see might dictate your next steps.
Cheers
DD
Turn the key 'on' without trying to start the engine. You should hear the fuel pump hum for 2-3 seconds. This primes the fuel rail at the engine.
Do you?
Next (and assuming you hear the hum), turn the key 'on', smartly jab the throttle a couple time, and then turn the key to 'start'. Any difference? The throttle jab should energize the fuel injectors, thus giving squirt of raw fuel into the cylinders. If this improves the situation then it sorta confirms a lack-of-fuel problem.
Also, when you change the fuel filter, empty the contents into a clear container. What you see might dictate your next steps.
Cheers
DD
Thread Starter
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Member
Joined: Jun 2015
Posts: 42
Likes: 14
From: St Albans - UK
Continuing with the 'no fuel' thoughts......
Turn the key 'on' without trying to start the engine. You should hear the fuel pump hum for 2-3 seconds. This primes the fuel rail at the engine.
Do you?
Next (and assuming you hear the hum), turn the key 'on', smartly jab the throttle a couple time, and then turn the key to 'start'. Any difference? The throttle jab should energize the fuel injectors, thus giving squirt of raw fuel into the cylinders. If this improves the situation then it sorta confirms a lack-of-fuel problem.
Also, when you change the fuel filter, empty the contents into a clear container. What you see might dictate your next steps.
Cheers
DD
Turn the key 'on' without trying to start the engine. You should hear the fuel pump hum for 2-3 seconds. This primes the fuel rail at the engine.
Do you?
Next (and assuming you hear the hum), turn the key 'on', smartly jab the throttle a couple time, and then turn the key to 'start'. Any difference? The throttle jab should energize the fuel injectors, thus giving squirt of raw fuel into the cylinders. If this improves the situation then it sorta confirms a lack-of-fuel problem.
Also, when you change the fuel filter, empty the contents into a clear container. What you see might dictate your next steps.
Cheers
DD
Turn ignition on - yes I could hear the fuel pump prime
Jabbed the throttle a couple of times
Tried to start it... no was the same just turned over quite a bit before it started
Thread Starter
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Joined: Jun 2015
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From: St Albans - UK
Hi,
There was no spark! Then started to spark and it started.
The spark looked quite weak
There was no spark! Then started to spark and it started.
The spark looked quite weak
Last edited by lambo911; Oct 10, 2020 at 05:51 AM.
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Posts: 17,809
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Hi Lambo911
Test the Spark on Both Banks and see if the Spark on one Bank is better than the other
That might narrow things down a little bit
Test the Spark on Both Banks and see if the Spark on one Bank is better than the other
That might narrow things down a little bit
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Member
Joined: Jun 2015
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From: St Albans - UK
I have found that the battery voltage has an influence..
The engine was turning over ok but the voltmeter was half way between 9 and 13
So I fully charged the battery and it fired up straight away.
My car has the two ignition amplifier units mounted on the front panel.
A while ago I was doing some work on the AC and I unplugged the front ignition coil. I forgot to reconnect it, started it up (started fine) and drove a few yards before realising something was up and the engine light also came on. I reconnected it and all was ok, but I think it is since then I have had this starting issue.
I wonder if running the engine with the coil disconnected damaged something ?
Cheers
The engine was turning over ok but the voltmeter was half way between 9 and 13
So I fully charged the battery and it fired up straight away.
My car has the two ignition amplifier units mounted on the front panel.
A while ago I was doing some work on the AC and I unplugged the front ignition coil. I forgot to reconnect it, started it up (started fine) and drove a few yards before realising something was up and the engine light also came on. I reconnected it and all was ok, but I think it is since then I have had this starting issue.
I wonder if running the engine with the coil disconnected damaged something ?
Cheers
Last edited by lambo911; Oct 12, 2020 at 03:48 AM.
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