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Author Subject: V Power Nitro issue
JWP EFi

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Post #1
Iv'e been running my 6 on this for the last week and tbh its never ran worse! feels very flat and hesitant, i thought that after the ecu had adapted to this, the engine would have pulled a wee bit better but as i say its worse than what it was before. I have done approx 400 miles, getting fuel from various places so it's not like it's dodgy petrol. I have recently replaced the Lambda, injectors and new air filter to replace the manky old oily one, car was running great then i thought i would start running on V power.
Anyone else suffered from same or similar?
Posted 17th Jan 2014 at 21:49
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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

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Post #2
Have you tried resetting the ECU during this fuel change? Dunno

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Posted 17th Jan 2014 at 22:02
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JWP EFi

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Post #3
Stan, i did that just before i first filled up then about 175 miles ago, no difference, should have said i have also replaced coolant temp sensor as well...Annoying, because the car was running so well before and that was on crap fuel
Posted 17th Jan 2014 at 22:04
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scotzman

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Post #4
I run V-Power Nitro all the time, car runs great (will blow up tomorrow now)

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Posted 17th Jan 2014 at 22:05
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JWP EFi

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Post #5
best way i can describe it is, if i accelerate fairly hard it begins to go then just bogs down, felt exactly how my old Mi16 did when it was running massively rich - boggy low down but after 6k it pulls ok
Posted 17th Jan 2014 at 22:08
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Chris28190

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Post #6
I had issues on Nitro + on a couple of fills then it ran smooth. I raised the issue with Shell and they 'investigated' the fuel quality as the garage I used and came back with nothing. I went from V Power to Nitro + and noticed how much worse it was the second I pulled away from the garage.

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Posted 17th Jan 2014 at 22:08
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JWP EFi

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Post #7
Chris, so after a couple of tanks you were ok? i reckon i'm not far off 2 tanks worth so far, i'm doing my weekly blat down the A68 on sunday to Durham so i want to get to the bottom of this
Posted 17th Jan 2014 at 22:10
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Chris28190

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Post #8
To be fair I tried another Shell garage and so far every fill has been fine. This happened to me when Nitro first came out and has been fine since.

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Posted 17th Jan 2014 at 22:27
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JWP EFi

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Post #9
I should also add that if i leave it ticking over for afew minutes, i can see puffs of black smoke from the exhaust which would certainly back up my thoughts of it running rich. I just can't see how a change in fuel can cause such a problem
Posted 17th Jan 2014 at 22:30
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pete-gti

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Post #10
Its higher octane fuel wouldn't bother unless in a supercharged 306 or very high performance one,
Posted 17th Jan 2014 at 22:38
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scotzman

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Post #11
pete-gti wrote:
Its higher octane fuel wouldn't bother unless in a supercharged 306 or very high performance one,

GTi 6's are mapped for superunleaded.

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'90 1.6 205 GTi, '98 306 GTi-6
Posted 17th Jan 2014 at 22:42
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JWP EFi

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Post #12
Higher octane fuel in a 'performance' hatch will always improve things, even if it only allows it to run better, clearly not in my case though. i'm going to do another reset then go for a decent drive, hopfully third time lucky
Posted 17th Jan 2014 at 22:49
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si_batt

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Location: Warwick

Registered: 01 Jan 1970

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Post #13
Have you got the correct coolant temp sensor? If the ECU is incorrectly reading the coolant temperature this may cause the air fuel ratio to be affected. I don't think changing fuel will cause this issue.
Posted 18th Jan 2014 at 09:19
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stan_306gti6 Forum Admin

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Post #14
I've always run Shell Optimax, then Shell V-Power and now Shell V-Power Nitro+ in my '6' without issues.

I run my bike on it also and it seems to like it.

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 18th Jan 2014 at 12:06
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SmartyC

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Post #15
I tried it recently. Seemed to pull a tad harder at the top end maybe, possibly a little smoother, but... It made the engine die at junctions... Using regular texaco now and it's fine..
Odd.

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Posted 18th Jan 2014 at 12:16
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jord294

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Post #16
Bp or texaco super unleaded for me every time!

Rallye runs a whole lot smoother. It does have a lightened flywheel, but seems to rev up quicker than when I first had car.

mpg is far better now, compared to shell or esso.

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Posted 18th Jan 2014 at 12:40
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daver6

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Post #17
Our cars can run super or regular so I don't see any issue with putting super in.

Shell doesn't agree with my Rallye. Tesco or Texaco super "seems" better. But I always get less range from Nitro+

I also whipped off the head off my old rallye engine after a few years of nothing but V-Power and it was coked up to f**k. More than I had expected to see!

Now I know sensors etc will have a fair bit of say, but I replaced all the sensors when I got the car so I think the excessive carbon build up is due to shell? haha that's as scientific as you'll get Wink

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Posted 18th Jan 2014 at 13:04
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eliotrw

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Location: Southwark

Registered: 18 Jul 2010

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Post #18
I have ran my car exclusively on nitro + since it was out and it has been fine. No issues

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Posted 18th Jan 2014 at 13:26
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SmartyC

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Post #19
Interesting...i'm off to look at sensors threads, as I haven't renewed any offing yet..

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Posted 18th Jan 2014 at 14:12
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JWP EFi

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Post #20
Plugged her in earlier today and got a fault code for the Map sensor, swapped it for another one from my 'stock', reset the ECU, 70 miles later and happy to say all is good, pulls as i would expect it to
Posted 18th Jan 2014 at 21:03
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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

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Post #21
Sounds like it was just coincidental then that it happened at the same time as a fuel change.

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 18th Jan 2014 at 22:26
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JWP EFi

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Location: edinburgh

Registered: 07 Mar 2010

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Post #22
been experiencing some weird electrical issues with this for few weeks now, each and every time ive had an auto electrician look at it he always points out the engine wiring harness, tbh ive been too lazy to swap it out.
Posted 18th Jan 2014 at 22:38
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bigbadbowen

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Post #23
Loom plugs next to rad would be first point of call especially if you have an induction kit rubbing against the wires ? Then I'd check the bitron unit behind the passenger inner wheel arch liner ? Check earths under the battery tray as well
Posted 18th Jan 2014 at 22:56
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