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Author Topic: Fault codes but whats wrong  (Read 3148 times)

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Baron Von Spongebob

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Fault codes but whats wrong
« on: 08 March 2009, 16:53:19 »
Hi
Have a problem today just managed to get home then did a paper clip test..Fault codes reading as follows.

73   Mass Air Flow Sensor Voltage Low

74   Mass Air Flow Sensor Voltage High

19   Incorrect RPM Signal

Think ive read the codes correctly but where do i go from here..
Down the pub is a good idea.. ;D
« Last Edit: 08 March 2009, 17:36:27 by Spongebob »
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markey mark

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Re: Fault codes but whats wrong
« Reply #1 on: 08 March 2009, 17:28:12 »
for the maf try putting a cable tie round the plug to pull it in to maf socket other is lambda sensor playing up  :y
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Marks DTM Calib

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Re: Fault codes but whats wrong
« Reply #2 on: 08 March 2009, 17:50:45 »
Crank sensor faulty....which can often also throw the MAF codes
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TheBoy

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Re: Fault codes but whats wrong
« Reply #3 on: 08 March 2009, 20:08:09 »
as mdtm says, the MAF codes are often erroneously thrown up when crank sensor fails
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Baron Von Spongebob

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Re: Fault codes but whats wrong
« Reply #4 on: 08 March 2009, 20:17:27 »
Cheers Guys..
Will replace the sensor then i think its up for sale, I fancy a change.. :)
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Baron Von Spongebob

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Re: Fault codes but whats wrong
« Reply #5 on: 14 March 2009, 18:38:15 »
Ok I changed the crank sensor,,Still the same.

Will tick over but as soon as i put throttle down it does not want to know..
Read the codes again 19 has cleared
still showing.
73
74
21..this is a new code it was not showing before changing the crank sensor..
Any ideas whats next anyone..
« Last Edit: 14 March 2009, 18:38:36 by Spongebob »
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Baron Von Spongebob

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Re: Fault codes but whats wrong
« Reply #6 on: 14 March 2009, 21:07:37 »
No suggestions, not even sod off.. ;D

Ok does anyone think it might be the MAF.. :question

Answers on a postcard... ::)
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RobG

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Re: Fault codes but whats wrong
« Reply #7 on: 14 March 2009, 21:33:08 »
Quote
No suggestions, not even sod off.. ;D

Ok does anyone think it might be the MAF.. :question

Answers on a postcard... ::)
21 is the throttle position sensor. Have you checked for any damaged cabling or shorting (voltage high).  :question Now "sod off" ;D ;D
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Baron Von Spongebob

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Re: Fault codes but whats wrong
« Reply #8 on: 14 March 2009, 21:35:19 »
Nothing visible....
I could go for an eye test though.. :D
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RobG

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Re: Fault codes but whats wrong
« Reply #9 on: 14 March 2009, 21:36:27 »
Have you tried driving it with the MAF disconnected :question
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Baron Von Spongebob

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Re: Fault codes but whats wrong
« Reply #10 on: 14 March 2009, 21:40:11 »
Not yet it got too dark to mess about in the end so will try a few things tomorrow...
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RobG

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Re: Fault codes but whats wrong
« Reply #11 on: 14 March 2009, 21:41:41 »
Post up results with it disconnected :)
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Baron Von Spongebob

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Re: Fault codes but whats wrong
« Reply #12 on: 14 March 2009, 22:20:10 »
Will post up tomorrow   :y
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Baron Von Spongebob

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Re: Fault codes but whats wrong
« Reply #13 on: 15 March 2009, 18:30:12 »
Ok disconnected the MAF sensor, Car still running the same but threw up code 57 so now i have
21
57
73
74
I will soon be up to ten codes this way.. :D

The car ticks over, As soon as you try to give it throttle it splutters, in fact it has backfired through the air filter a few times..

You can get it to rev quite fast and it stays there no problem but letting off the throttle back to tick over then try to throttle again then splutter splutter.. ;D

A few weeks ago i posted about possible fuel contamination.I fueled up at the local Morrisons and within a mile it didnt want to tick over, anyway after complaining and sending trading standards there they come back to me and said.

The supermarket had a delivery of petrol on Saturday morning. I fueled up on Saturday afternoon but, They also had a delivery on Sunday afternoon, strange i would say, so therefore Trading standards couldnt take a sample..I offered a sample from my car but no reply..

What i am getting at is, would it have buggered up my Lambda sensor and would these symptoms point to the Lambda..

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RobG

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Re: Fault codes but whats wrong
« Reply #14 on: 15 March 2009, 19:17:57 »
57 is the IACV you`ve got no code there for the lambda sensor. All I can suggest (with code 21 as well) is clean the IACV and the throttle body :-/
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