Thread: Strange issue after Shell V-Power RON95

Hi guys,

Very strange issue here.

'98 Primera P11
SR20VE
Powerland ECU, mapped for 98 but should be safe for 95

Yesterday I saw at my meter that I had to fill her up. I always use BP Ultimate RON98 but this time that wasn't around so my only choice was Shell V-Power 95. I only put half a tank in it.
All sorted and I went home. When I got home I parked the car and let it run a few seconds. Then the car started to idle very lumpy, like I had some wild cams. Going from like 750 to 350 up and down.

When I wanted to drive away again the car hesistated up to 3000 rpm. After 3000 rpm it took off like usual.

I immediately topped her off with BP Ultimate 98 and that seemed to work to a certain level. No worries while driving to a friend of mine. Going back, also no problems. But when I left for work this morning the lumpy idle and hesitation continued. On the freeway no problems. Engine cold or hot doesnt matter.
Today after work again I topped her off with BP Ultimate 98 without any direct result...

WTF can this be? Everything worked perfectly before I put V-Power 95 in it...

I'm going to check if my TPS is going bad. Does anyone knows if a TPS sensor from a DE will work?
Like this one?

Shell V-Power is actually more or less RON97. But since that number isn't really allowed, they call it 95...

Source: Wikipedia and AMT.nl (Dutch).

So I'd look for something else.

Ok. Well, I will be going to check/clean the MAF sensor, measure my TPS sensor, clean the IACV and disconnect the battery terminal to clear any codes.

Disconnecting the battery isn't going to clear any codes, unless you leave it disconnected for a few hours, minimum.

Clear codes by using the diagnostics screw on the back of the ECM brain itself. Post up if you don't know how to do this.

Yes a DE tps will work. The pic your posted is an automatic tps but it will work.

This just sounds like a vacuum leak to me

How to check for a vacuum leak?

The easiest way is to spray a combustible lubricant (CRC, maybe WD40 etc) where the leak/s may be. RPM will increase if engine gets extra fuel through the leak.