RangeRovers.net Forum banner

1 - 7 of 7 Posts

·
Registered
Joined
·
11 Posts
Discussion Starter #1
I have 2xp38s a 4.0 and a 4.6 both now have an odd starting fault they will fire up straight away but die if the throttle is not pumped rapidly to keep revs over 1500 but will not rev over 3000 and spits back frequently for a minit or so when it suddenly clears and runs perfectly all day or until cold again ecu shows no fault codes and when warm runs perfectly
Tried cahnging thermo switch cold start maff throttle pot no difference any ideas ?
 

·
Registered
1995-2002 Range Rover P38A
Joined
·
117 Posts
Sounds like no it a rich enough starting mixture when cold.

Does your truck have the strange shaped air boxes on the inlet pipe, between the MAF and the plenum? They are there to act as an inlet air noise silencer. What I found on mine was that, as the bottom of these are very close to the exhaust manifold, the bottoms had holes melted in them, allowing unmetered (and unfiltered) air to enter the engine. If something like this has happened to you, then you would be getting more (possibly a lot more) air into the engine that the MAF “sees”. When cold, this may create a weak mixture, giving exactly the issues you report.

Oh, in terms of a fix, I siliconed the holes up, no more problems.
 

·
Registered
1995-2002 Range Rover P38A
Joined
·
450 Posts
check fuel pressure from the shraider valve on the fuel rail 38ish psi before and after starting and running. should not be more than 2psi or so pressure difference
 

·
Registered
Joined
·
11 Posts
Discussion Starter #5
Changed for new and also tried working one from my new one (now got 3 )
It should start and idle without the flow sensor connected as the map uses its base setting but not rev up
 

·
Registered
Joined
·
369 Posts
There's already another thread running for this, "Flooding up when cold" shall we keep it in one place maybe?
 
1 - 7 of 7 Posts
Top