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  #1  
Old 19th-April-2010, 20:18
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Join Date: Sep 2008
Location: Tring hertfordshire
Posts: 48
Default coolant temp sensor?

I went to get my p38 4.6 running last weekend after standing for about a year and it wouldnt go, i took the plugs out and cleaned them and it then went first turn of the key. I had it running for an hour and it ran lovely so was well happy! I hadnt started it since doing the head gaskets so all is good. I then left it and went to start it again and it struggled to start and was missing. I stuck my snap-on scanner on it and it said engine was running rich and it said coolant temp sensor had falling temp? Are the sensor a common fault on the v8? Its strange how it keeps flooding? Any help would be good. One other thing is on the passenger side i seem to have what looks like atf dripping onto the cat? not been under to look yet but any known probs?
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  #2  
Old 19th-April-2010, 23:43
wammers's Avatar
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Join Date: Oct 2008
Location: Preston Lancs.
Posts: 26,344
Default Re: coolant temp sensor?

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Originally Posted by ROBV8 View Post
I went to get my p38 4.6 running last weekend after standing for about a year and it wouldnt go, i took the plugs out and cleaned them and it then went first turn of the key. I had it running for an hour and it ran lovely so was well happy! I hadnt started it since doing the head gaskets so all is good. I then left it and went to start it again and it struggled to start and was missing. I stuck my snap-on scanner on it and it said engine was running rich and it said coolant temp sensor had falling temp? Are the sensor a common fault on the v8? Its strange how it keeps flooding? Any help would be good. One other thing is on the passenger side i seem to have what looks like atf dripping onto the cat? not been under to look yet but any known probs?
The temp sensor tells the ECU if the engine is cold or hot. The ECU then alters the fueling to suit. If the temp sensor is telling the ECU the engine is cold when in fact it is hot it will over fuel. Effectivly putting the choke on as if you were running from cold.
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Old 20th-April-2010, 00:23
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Join Date: Jun 2006
Location: Fleetwood Lancs, Besides the Sea!!!
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Default Re: coolant temp sensor?

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Originally Posted by wammers View Post
The temp sensor tells the ECU if the engine is cold or hot. The ECU then alters the fueling to suit. If the temp sensor is telling the ECU the engine is cold when in fact it is hot it will over fuel. Effectivly putting the choke on as if you were running from cold.

And its Wing Commander Tony (Wammers) Rip Rap to the rescue Giving THE ONE, THE ONLY, possible cause for this problem!!!!

& All whilst Swoopin down from on high & doin a Victory Roll in his aircraft "The Pegasus" over building 38A in Solihull
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Old 20th-April-2010, 09:40
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Default Re: coolant temp sensor?

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Originally Posted by the hooded claw View Post
And its Wing Commander Tony (Wammers) Rip Rap to the rescue Giving THE ONE, THE ONLY, possible cause for this problem!!!!

& All whilst Swoopin down from on high & doin a Victory Roll in his aircraft "The Pegasus" over building 38A in Solihull
Unless you can think of something else Keith?
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Old 20th-April-2010, 10:55
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Location: Aberdaron, Gwynedd, North Wales
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Default Re: coolant temp sensor?

Ey you two...I'M THE MISERABLE GIT ON HERE !!!

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Old 20th-April-2010, 11:00
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Default Re: coolant temp sensor?

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Originally Posted by wammers View Post
Unless you can think of something else Keith?

Not at all Tony, I completely aggree with your diagnoses mate, It never ceases to amaze me just how much info is stored in the various members heads on here.

We should start a mobile P38 repair business, me & you can cover the North West, & the other guys on their local areas (& when it all goes REALLY BAD we can send fer Irish to re-code everything!!)

We'd be millionaires in 12 months!!! ..... (Or all in Hospital with STRESS!!)
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Old 20th-April-2010, 11:25
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Default Re: coolant temp sensor?

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Originally Posted by the hooded claw View Post
Not at all Tony, I completely aggree with your diagnoses mate, It never ceases to amaze me just how much info is stored in the various members heads on here.

We should start a mobile P38 repair business, me & you can cover the North West, & the other guys on their local areas (& when it all goes REALLY BAD we can send fer Irish to re-code everything!!)

We'd be millionaires in 12 months!!! ..... (Or all in Hospital with STRESS!!)

ECU temp sensor is a generic cause of over fueling, bad cold start, bad hot start on ANY ECU controlled motor. People will put their vehicle in a garage and end up with a big bill for this that and the other, when around 15.00 and a spanner could in many cases cure their problem.
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