[Bokoshi]

I'm having a cutout/hesitation issue with my soft top GV. Mainly noticeable on light acceleration around 1.5 - 2k rpm but can happen at any rpm, its not constant and seems rather random.
The problem is like it hiccups and drops all power for a split second and recovers as it never happened.

I'm at my wits end trying to diagnose the problem, so far I have:
Replaced fuel pump - no change
Cleaned out EGR valve with new gasket - no change
Had injectors and fuel rail cleaned yesterday - no change
Put new earth leads onto engine - no change
New battery - no change
New spark plugs (platinum) - no change
New timing belt - no change

The timing was out by ~5 degrees advanced which i fixed but made no difference, I actually lost power =/
The fuel pressure was a little low on the gauge so I manually regulated the fuel pressure to spec by clamping the return line but the problem still remained.
I have individually unplugged the egr, evap system, o2 sensor but no change.
I have also used a diagnostic computer and taken it for a few runs but nothing obvious shows up on the readings, no sensor dropouts/incorrect readings.

The camshaft position sensor housing is full of oil, is that normal or should it be dry?

Anyone had sometinh glike this issue

The car is a 2000 Grand Vitara soft top with G16B efi engine.

[gravity_powered]

Sounds like what my V6 was doing before an oxygen sensor packed up. I happened intermittently for quite a few months before the engine light finally came on.

Cam sensor being full of oil doesn't sound right to me either.

[twitchy]

gravity_powered wrote:

Sounds like what my V6 was doing before an oxygen sensor packed up. I happened intermittently for quite a few months before the engine light finally came on.

Cam sensor being full of oil doesn't sound right to me either.

+1 That is eggzackerly what mine did when the O2 sensor shit itself...

With the cam being 5 degrees advanced it will give you more power through bottom end-mid range & you loose a tiny bit off the top. Quite a common mod on a lot of cars.

[Bokoshi]

Thanks guys,
I will try and source a O2 sensor locally today. I'll pull the cam sensor housing off next week and reseal it.

Heres hoping..

[BlueSuzy]

Does it have a TPS?

[JrZook]

Yep .

[BlueSuzy]

ive had problems where my tps lost something then car would die, then come alive again. Doing 110 uphil on a freeway in traffic, this is not good!

I loosened the tps and wiggled, and did it back up. Problem gone.

Weird, but someone else has had this prob also, cant remember who.

[Bokoshi]

I don't think its the TPS.
I have taken it off and checked with a multimeter, doesn't drop out across the whole range.
Scan tool doesn't show any dropout on it either when it hiccups.
I'll have a play with it none the less just to be sure.

[oozuk]

have you checked the resistance of your ignition leads ??

[Bokoshi]

Havent actually run a multimeter over the leads yet but I put my gti swift leads on it (read: bastardised them to fit down the plug holes), didnt make any noticable difference.
However I am starting to think its either leads or coil packs, but the service manual has no mention to what the resistances of the coils should be.

[royce]

Same engine, different ECU system, would have a light hesitation when you just push the pedal to accelerate in crawling traffic etc at low revs, adjusting the TPS fixed it