Over fuelling issue with mk1 V6

[donnac]

Hi guys,

Looking for advice with my mk1 v6, the other day when starting the car I thought the car had a louder higher revving tic over than normal, once I set off it seemed to run fine.
I used it to go to work the next day and it cut out under 2k revs and wouldn't restart.
Left it for 10mins and it started again but after a couple of miles it cut out and wouldn't start.

Got recovered by the AA, who checked the fuel pump and spark, they initially thought it was the fuel pump however there is fuel coming through.

One of the ht leads was broken (possibly AA man) so bought new leads yesterday and the plugs were black with petrol so replaced them too.

Started it up and it's a hesitant start and after 2k revs the exhuast has black smoke and a fuel smell.

I turned the car off and tried to restart and the car would not turn over again, left for 20 mins and it fires up again but with the same symptoms.

Any ideas what to check next?

Don't think the car wants to leave me, I've had no issues in the year I've had it and then the night before it's being sold it does this :)

Thanks guys

Donna

[cdwood2010]

All cars are female, and therefore unpredictable. :)

Couple of ideas in no real order.....

• Oxygen sensor faulty, possibly wire off? Theres one on each exhaust bank
• Throttle posistion sensor faulty / unplugged
• Air getting in somewhere, throwing the mixture out
• Dizzy worked loose / cracked cap
• AFM stuck open, pull the air filter off and check for movement. (pretty sure a 3VZ has a wee fit if you push the flap open manually when its running).

These are guesses, things i would start with after plugs and leads.

It will also be worth pulling diagnotic codes, crude but insightful. All you need is a paper clip.

Also i have many spare bits, and accept beer, chocolate and hugs as fair trade.

Chris.

[headcase]

Check air flow meter , it can get stuck slightly open giving it a rich mixture .:-)

[donnac]

as usual guys many thanks for your help. We are also going to check the cold start injector as it maybe faulty and we will check the other fault possibility from the suggested lists.
Thanks again and will keep you updated on how we get on, cheers Donna

[cdwood2010]

You can Prob disconect the cold start plug, see if that solves it. I have spares, but I think that part might be generic.

Make a list, check the easy stuff first.

C.

[adamh]

i had a similar problem , where it would cut out when you slowed down, that was on a hot few day trip to europe. I replaced the leads and plugs and coil, with new items, and added a thermostatic engine bay fan and it never gave me the same problem again. has the fan been running when it cuts out? its always smelled rich due to the over pressure from the turbo pump and the mk1a's inability to deal with fumes. tps should be perfect , although its worth checking/reseting, instructions in the binder. there are some very thick earth straps on the engine, -> front lower crossmember chasis rail, and one on the gearbox/head, check they are still attached/have continuity. there is an afm earth check it has continuity etc to chasis. safc might be worth removing/decommisioning if you cannot get to the root cause , its not difficult, the soldered joins are under the black tape , shrink wrapped, you could easily remove them. ecu has a seperate earth next to it also, check it.

[donnac]

I spoke to a Toyota specialist and he reckons it is an ignition problem. Any ideas? I am willing to try a new coil and any other part of the ignition system. Is there something called an ignition module? Cheers

[cdwood2010]

Did you check the above stuff yet?

C.

[adamh]

there is nothing called an ignition module, you have a coil, resistor pack, dizzy/cap, leads, plugs. the only thing that was not new was the resistor pack, and the rotor arm inside the dizzy

[donnac]

Hi, yip we did and they seem okay. What is the ECM? and is it worth checking? The car is at my cousins yard and he has limited knowledge and equipment and it looks like I will have to pay £60 for another garage to uplift it and sort the issue but this bloke was adamant it was an ignition issue. Any ideas around the ignition side of things and is it worth changing the ignition control module and coil. When we tested the spark plug for sparking it seems to be strong for a second and then a weak spark thereafter like a small blink, I hope this symptom helps. Thanks