Hesitation under power

[TVB]

Hi all. I'm having a few issues with my VR6. Car starts fine, idles smoothly, and drives great when driven normally (i.e. not caning it), but after the engine's warmed up and I give it some in second, I get these flat spots of power. Sometimes very short like a hicup and sometimes they last a bit longer, for a few seconds. It almost feels like not all cylinders are firing. Then it will all kick in again and off we go. I don't get it if I feed the revs gradually, it only seems to happen when I'm flooring it. It also doesn't happen every time. I'm thinking it's electrical or something to do with the injectors. Can anyone point me in the right direction with this?

Cheers,
Thomas

[tassie_euro_mk1]

Hey Thomas.

I have just recently (yesterday) come across the same problem. spoke to my old man whos a mechanic and he said to replace the fuel filter. When I bought my VR6 we never replace the fuel filter so thats whats got us thinking...


Check it out. could well be it

[Golf Loon]

coil pack or throttle body.

Try reving the motor at night and see if you get a fireworks display from the coilpack, its on the end of the motor above the gearbox.

[TVB]

Thanks. I'll look into your suggestions and let you know how I go.

[Mrk_Mickey]

I had (haven't noticed in a while) the same problem with mine, and my thread was replied where many said could be sparkleads + sparks. I will get around to fixing them if I notice the problem again but even that doesn't guarantee the problem be fixed.

[tassie_euro_mk1]

Hey Thomas

just wondering if you have fixed this problem...

[ausgolfer]

If it's not the leads I'll eat my hat

[tassie_euro_mk1]

i have replaced my fuel filter thinking it was blocked. Although it was very very dirty it wasnt blocked.

Still does jerks and plays up occasionally. No fireworks from the coil pack...

My leads are aftermarket ones. Magnecor Competition. would it be them?? arnt they generally a good brand?

[Tim]

magnecor are a good brand. I have some with no probs. But what carl refers to is daves car which was doing exactly the same thing. But yeah it could be leads or coilpack or something electrical like that.

Where abouts are you located TVB?

[TVB]

I'm located in Rozelle, NSW.

I haven't solved the problem yet and it seems to have got worse. It never happens in the first 10 mins of a drive (don't worry, I don't boot it till things have warmed up a bit). I do get a bit of choking just after start up, when i change to second gear. I'm thinking it's not the fuel filter but maybe the coil pack or throttle body as Golf Loon suggested.

tassie_euro_mk1 - what's your next move after the 'no fireworks'?

[tassie_euro_mk1]

tvr i dont know what my next move is yet...

I might check the fuel pressure and the throttle body. although it does seem to be more of a "sharper" jerking. which i think would be an electrical problem rather than fuel.

but unsure

Ive had a few good drives where it has run just beautifully.

[mollins]

Afm??

sorry i dont know if the vr6 has an AFM or not, but Ive had this problem in other cars and has been fixed by a good clean out of the AFM cos sometimes it sticks giving wrong A/F.. i just used carby/throttlebody cleaner and it fixed it right up.. if there is no AFM.. please delete this post

[Mrk_Mickey]

TVB as you're in Rozelle, you're not far from my mechanic who has just helped one of my VR6 mates with a new coilpack and leads. He also had the same problem to you and I, and although I thought my mate's problem might only be leads+sparks, he took it to my mechanic and found the problem and got it sorted.

Steve Natoli
0414 579 538
9744 8888
Rear 332-334 Parramatta Rd, Burwood

Hope this helps

[tassie_euro_mk1]

sorry i dont know if the vr6 has an AFM or not, but Ive had this problem in other cars and has been fixed by a good clean out of the AFM cos sometimes it sticks giving wrong A/F.. i just used carby/throttlebody cleaner and it fixed it right up.. if there is no AFM.. please delete this post

mollins do you mean Air Flow Meter? if so yea VR6's do have airflow meters. Mine was knacked and was giving a bad A/F reading but i got a new one and has fixed that problem. But a new problem now lol. This problem has similar effects like AFM but in my case, cant be it. Surely...

TVB, have you checked your Air Flow Meter???

[mollins]

mollins do you mean Air Flow Meter?

yep

sorry .. too used to acronyms.. i guess thats what happens when you work for the government (especially the CSIRO)

good luck finding the problem guys