Car wont rev when cold

[muggo05]

hey guys when my engine is cold and i go to rev it, it coughs and splutters and wont rev unless i use a minute amount of accelerator pressure. it is like its not getting enough fuel or something, but only when cold.

when the car is warm/hot it is fine.

Any ideas?

[kopper69]

Have a check for codes and start with a service if you havent done one recently - do your filters (particularly the fuel filter), oil, plugs etc and maybe leads if you havent done them for a while etc. May not fix your problem but its a good starting point anyway.

[alien]

Can you smell petrol when you open the bonnet? I know the VP and VR's are prone to dropping the fuel line to the injectors off the block only a tiny bit but enough for them to leak in the cold. May have still been a problem with the VS's

[hako]

Sounds like the coolant temp sensor isn't telling the ECU the engine is cold resulting in a lean mixture till the engine warms. They are cheap and easy to replace.

[muggo05]

have only just bought the car and drove it for a week before i flew out O/S, the day after i bought it i replaced the front engine mounts, oil and oil filter, and new gold plated plugs. when i get back i am getting a new set of leads and will change the fuel filter.

i dont remember smelling petrol under the bonnet but i will check again when i get home and get the fuel lines looked at.

i know that it makes it hard to answer questions when i am overseas and cant do the things your telling me but will start with these when i get home. was just wandering if this was a common problem or not.

thanks for your help

[muggo05]

Sounds like the coolant temp sensor isn't telling the ECU the engine is cold resulting in a lean mixture till the engine warms. They are cheap and easy to replace.

ok cool thanks i will replace that when i get home too, where in the engine bay is it?

should i do the water temp sender at the same time?

[SIG-054]

im pretty sure hako is on the money.

The engine is too lean when its cold, thats your problem.

[hako]

Its the fatter one under where the top radiator hose meets the engine .... nearer the DFI module. When you buy a new one you'll recognise it when you look there. Best to undo with a ring spanner but a shifter will do at a pinch. Apply PTFE tape or a sealant to the threads if you want to but it's not necessary.

[muggo05]

awesome thanks for the help guys, you guys are good!

[muggo05]

ok i replaced the WTS and still doing the same thing. had the whole cooling system flushed out and refilled with new coolant, new thermostat, and new CTS.

when i first start the car and rev it, it coughs and splutters like it is going to stall and if i give it a decent stab, it will stall.

any ideas anyone? putting new leads in tomorrow, plugs have already been replaced.

[VSIIBerlinaL67]

mine does the same thing some times, but mostly after i disconnect the battery. maybe it could be the tps or iac?

[burnz]

hey guys when my engine is cold and i go to rev it, it coughs and splutters and wont rev unless i use a minute amount of accelerator pressure. it is like its not getting enough fuel or something, but only when cold.

when the car is warm/hot it is fine.

Any ideas?

is your car running LPG ??

[muggo05]

nope no lpg

[muggo05]

*BUMP*

anyone got any ideas?

[muggo05]

*BUMP* anything?

[hako]

You said you replaced the "WTS" which means water temperature sender....the one you need to replace is the CTS - coolant temp sensor (which talks to the ECU).

[PSYKO PHOENIX]

sounds a bit like an issue im having wth mine, when its cold and a give it a lil kick it coughs and splutters untill it gets higher up the rev range, could it be the same issues?

[muggo05]

yeah i just saw your thread! any progress yet mate?

[PSYKO PHOENIX]

nope unfortunatly not, at the mo iv got no gas in the tank and no money at all till monday, so im prety gutted bout the whole thing lol

[muggo05]

i might take mine down to mechanic mate today to get the regulators checked out. he is going to do my leads to which he said were "arcing out".

[muggo05]

You said you replaced the "WTS" which means water temperature sender....the one you need to replace is the CTS - coolant temp sensor (which talks to the ECU).

sorry i was wrong i did replace the CTS, not the WTS. might get the IAC looked at then.

i'm getting shit fuel economy too, barely can get 400 to a tank and i'm granny driving it everywhere.

[PSYKO PHOENIX]

howd you get on with the mechanic?

[OzJD]

I had the issue before, similar to your starting issue
As well as
* It sometimes stalling for no reason (its an auto)
* Terrible petrol consumption (Made V8's look cheap - Mine's a V6)
* OCCASIONALLY would receive error codes... shows oxygen sensor lean and something else
* Pile of black smoke coming out when starting car

Was a faulty fuel regulator.

Hope this helps
OzJD

[muggo05]

I had the issue before, similar to your starting issue
As well as
* It sometimes stalling for no reason (its an auto)
* Terrible petrol consumption (Made V8's look cheap - Mine's a V6)
* OCCASIONALLY would receive error codes... shows oxygen sensor lean and something else
* Pile of black smoke coming out when starting car

Was a faulty fuel regulator.

Hope this helps
OzJD

*mines never stalled on me (auto as well)
*same really bad fuel concumption
*has been doing it with no error codes
*no smoke at all

will check error codes again just to make sure, getting the leads done today which i will get the IAC looked at too so will post back this afternoon after the mechanic has a look at it.

[moff_man]

one thing causing all the problems with fuel ecconimey and what not will be the air flow meter un plug it and it will rev but its not driveabol like this, plug it back in and it will run like crap again