Stalling Problem VN

[Raymond Packets]

Hi , I have a problem with my v6 VN stalling alota the time , it happens most when shifted into park or nuturel ,it idles smooth as when cold and runs perfectly all day on some days but on others its different after its been driven for a few hrs it will start to idle a little rough befor stalling but only ever stalls at low revs and it also becomes harder to start , if the engines cold no probs but after a few hrs driving it starts to become very frequent even to the piont that it will stall in drive if cruising very slowly . Im running it on LPG but it behaves the same on fuel , I just replaced the coolant sensor and the temp gauge sensor because the thermofan wasnt kicking in and the temp gauge wasnt working , the new sensors fixed those issues ...does anyone have a suggestion as to what could be the cause ?

advice appreciated

[doubledip]

lots of basic things to first check/do.

replace plugs - make sure gapped correctly
replace/check leads
clean throttle body and IAC motor and do a base idle reset (this one is a must)

[Raymond Packets]

lots of basic things to first check/do.

replace plugs - make sure gapped correctly
replace/check leads
clean throttle body and IAC motor and do a base idle reset (this one is a must)

thank doubledip , I will go ahead an do those checks and clean the throttle body and the IAC , could you please explain to me how to perform a base idle reset ?

[88GreenVN]

Also you could look at the CAS - if this starts to fail it most often fails when the engine gets hot.

VN's stalling can be 1 or more things - slowly dieing the dreaded electrical system meltdown

First we replace some or all the sensors, (the O2 and temp sensors are popular) then the plugs and leads, then the CAS, DFI unit, coils, relays and fuses, fuel pumps and regulators and injectors. And when we have finished the cars get a new memcal tune and the cars a rocket again.

Now the VR/VS/VT drivers were laughing at the VN drivers a year or so ago BUT guess what the same thing now happens the them too.

The electrical systems in the VN/VG/VQ/VP can be a bit dodgy at times but if you check your codes or hook up a laptop to the ECU when driving you can get a much better idea of what the problem may be.

[Raymond Packets]

thanks guys I will do , I just wanted to add that it blow blues smoke on start up just lately since its been stalling and getting hard to start ya gotta wind it over an pump the throttle to get it goin even so is seems floody like when it fires up for a few seconds , after that runs fine under load not smokey ....also its got a new coil pack on it ....hmmm

[Raymond Packets]

can anyone fill me in on how I go about performing a base idle reset?

CAS ??? what is CAS ???

[Raymond Packets]

I just realized CAS is crank angle senson ,,,,rrrrrr,,,,its got a reasonably newie in it

[88GreenVN]

How old are the plugs/leads?

Also I've not herd of a base idle reset - unless that is taking the main fuse out for a bit and putting it back in. (in the little fuse box in front of the box with the relays in it.) This resets the ECU. Check for error codes first before you do this.

[Raymond Packets]

the leads are are two weeks old but I checkem with ohm metre , the plugs ? I will pull em out an check em as well tommorow , yeah I done a search on reseting the base Idle an yeah I think ya right just remove battery leads or engine fuse for 30 secs or so , I removed the enjine fuse this mornin for 25 min , didnt help cars still playn up , I cleaned the throttle body out this eve but havent had a chance to see if its helped as yet will see how she goes tommorow if the same I will continue following on doin whats been suggested , I really appreciate the help ,

Raymond

[88GreenVN]

The smoke is probably unburnt gas so the plugs could be the problem. If the leads are new they should be OK and not the problem. When you put in new coils did you replace the DFI unit too?

I'm not up with gas cars so no real help here for ya.

[Raymond Packets]

your a great help 88GreenVN and yep new coilpack and DFI unit put in 2 weeks ago

Raymond

[Raymond Packets]

Cleaning the throttle body an reseting the base idle last night today the problems still exist

ok today I checked the leads an plugs both OK , plugs quite clean and as new , leads good ohm readings ....

tested the volts on the O2 sensor now the manual I have quotes 0.010-1.000 of a Volt engine at normal operating temp

Ok I got 0.040 - 0.096 of a Volt ..


then I test ran the car with and without the O2 sensor hooked up ,

With the Sensor UNHOOKED
#it didnt stall as often or a quickly when engaging P or N
# ran a little rougher

Overall the difference was so slight wether I had the O2 hooked up or not , so Im thinking that if the sensor is Faulty that may be why no real difference noted .....On the other hand if the O2 Sensor is not faulty wouldnt the car have really miss behaved when driving it with the sensor unconnected ????

I will do COLD test on the O2 sensor in the morning my manual states reading of 0.35 - 0.45 of a volt

Im thinking well hoping that its the O2 causin the probs , got a price on one today $70 cant really afford it at the moment , but I may haveta bit the bullet unless someone has a better idea of what else I should check

Raymond

[88GreenVN]

When my o2 sensor packed it in, the connector was corroded too and still failed after fitting a newie. So just check that the connector is making good contact.

[Raymond Packets]

When my o2 sensor packed it in, the connector was corroded too and still failed after fitting a newie. So just check that the connector is making good contact.

great tip 88GreenVN ! I checked it today and its very clean no corrsion on the connection , Im thinking I will pull the old one and clean it first if the volt test in the morning is in range , I dont know wether it will help but I shall give it ago as I cant afford to put any more debt on my CC ,,but I gotta have the car runnin good ! thanks for continualy checkin in an helpin me


Raymond

[Raymond Packets]

88GreenVN what were the symtoms when your O2 failed ?

[88GreenVN]

88GreenVN what were the symtoms when your O2 failed ?

Cant say on that - but the o2 sensor tells the ECU how much fuel to put in so if its dodgy the ecu will get the wrong reading and put too much in or not enough - rich/lean mahem for the engine.

[Pom_3.8]

SOunds like exactly whats happening to me, i replaced the thermostat the other night and put on a shorter fan belt as my air con pump gave up and was making a whining noise. gave the throttle body a clean while i had it all off and then reconnected everything now it sounds fine when you build the revs up but with low revs the car is shaking and juddering. im at a loss replaced the coolant sensor as well. The car jolts when ya put it into gear and if in gear and hold the brake will just stall on you. and hates reverse. Help? Im at a loss here and on my budget cant afford to go to a mechanic