|
At idle both HC and CO emissions high. All readings drop to acceptable levels at higher rpm No fault codes from ECM. Only indication from diagnostic computer is that manifold pressure high. Any suggestions to what the problem is?
|
Blimey! Don't want much do you!! The list of potential faults must be as long as two arms, making remote diagnosis very difficult. I dare say someone like Adam will be along soon to let you know the common faults that can cause this on your car.
In the meantime: easy things to check yourself:
condition and security of all wiring
condition of all hoses
try listening for an air leak in throttle area (use a pipe or stethoscope)
condition & security of HT leads
condition of plugs
cleanliness of throttle body & butterfly (clean with toothbrush & carb cleaner if dirty)
operation of throttle & cable
use a stick to listen to each injector to see if one is significantly different to the rest
any kind of blockage in the inlet
exhaust gases flowing out the back end freely
operation of temp sensor (not foolproof, but leave idling to make sure fan comes on & off)
|
There's another Adam on here? Because I sure as hell don't know anything about Rovers...aside from the K series engine reliability of course. Come to think of it I don't know much about Fords, Vauxhalls, Alfas, VW's, BMW's, MB's, Renaults, Citreons, Peugeots, Nissans, the list is endless.
Adam
|
|
|
|
You may have a problem with the idle control valve.I would check out the air bypass pipe first from the throttle housing to the valve.also check the breather pipes off the cam cover to manifold.left hand pipe goes into throttle body.right hand into main intake.assuming its the same layout as earlier rover.the right hand pipe has a habit of splitting on the inside so you have to remove to see it.I may be wrong on both counts but worth a look.
--
Was mech1
|
|
|
Blimey! Don't want much do you!! Just the moon on a stick :-)
Ok what has been done so far new ht leads plugs fuel filter and temp sensor. Timing checked ok Compression check carried out results 1 to 4 as follows in bars 9 10 10 8. Placed on the rover fault diagnostic puter and the only indication given was the high manifold pressure Reading was 58 which is apparently on the high side.
Thanks so far people for the advice keep them coming ta
|
As a ps.when was the air filter last changed?
--
Was mech1
|
|
Sorry missed that new air filter all ready fitted.
|
As a matter of interest.Have you checked out my above post.I mean before the air filter.
You didn`t mention whether you had or not.these pipes need to be checked as that may be the problem.?
--
Was mech1
|
The clue here is the ECU manifold vacuum reading of 58KPa should be much higher (lower?) at less than 40. Common failing is the MAP sensor in the ecu going faulty but you need to check the actual vac reading with a manometer connected to the inlet manifold, should be indicating about 18-19" mercury in old money. If it is reading low, say 15" then you have a valve timing issue if reading correct then ECU at fault. Try cleaning out the vacuum hose from manifold to ECU first.
Andrew
--
Simplicate and add lightness!!
|
|
|
|
