Why does my car hesitate on acceleration?

Question

My car hesitates really badly on acceleration. It is a 99 vaux corsa. It has had alot of work done luckily all under warranty including a new crank shaft sensor, idle control valve,mass air flow sensor,new air & oil filters,throttle body repair,oil changes. My EGR valve seems to be working fine and the lambda sensor seems to be fine. I have also changed the fuel filter and used a number of bottles of fuel system cleaners and catacleaners. Is there anything else it could be other than being a crap car?

Answer 1

The throttle position sensor,(tps) which I don't see mentioned, is a common cause of hesitation. Also dirty fuel injectors. The tps tells the computer how far the throttle is open. The computer uses this info. to determine how much fuel is needed to maintain the correct air/fuel mixture and when extra fuel is needed if the throttle suddenly opens wide. The dealer should have a scan tool in a computer that can check these sensors. It takes a knowledgeable mechanic, which apparently you don't have working on your car, to solve these problems. Replacement by guess is very expensive and time consuming, let alone frustrating for the customer. Don't blame the car, it is only a mechanical device, the "mechanic" is the crap part.

Answer 2

you may have actually drugged it to death,,too much cleaner in the gas is not good for it,,it might have weakened the fuel in it,or loosened up some things that may be getting into the fuel system,and be making it run like this,, id take it,and have auto zone scan it to see if it has any trouble codes in it,this might help narrow it down a little bit,,with what all that has been done to it,it should be running really good,so id try and see if i could retrieve any codes from it,,other than that i cant think of much it may need other than a fuel pump,this will cause it to do that also,,good luck,i hope this help,s.

Answer 3

Could be lots of things, fuel restriction, air leak, ignition system, throttle sensor, all sorts . . . Go to a dealer with the right equipment and intelligence to read the codes and sort the problem. If you've just had work done, go and shout at them.

From your symptoms, one thing it an't is a slipping clutch.

Answer 4

It could be something as simple as a duff spark plug or a faulty ht lead shorting to earth , lift the bonnet with the engine running lift the throttle so the engine is running fast listen for a sharp crack every now and again if the engine hesitates every time it cracks you have a bad ht lead, if its dark lift the bonnet and look for blue sparks around the ht area if there is don't touch them they are high tension sparks and will give you quite a jolt

Answer 5

from your description it suggests a loose hose, which is creeating an air leak. when you demand power it also sucks in far too much air, the hesitation is the engine trying to stall ,the momentum of the crank keeps it going.

have you checked the rotor arm, are the points corroded in the dizzy cap, it could of course be somehting just done, and faulted almost immediately... justtake it back to the dealers and get it fixed all under teh warranty....

Answer 6

Babe I may be wrong but my car is a NissanAlmera O4 reg and it the same, I put it down to the clutch and taking it in on monday. It revs like mad and goes nowhere. Dont about you but mine worse going uphill, it stupid and wont pull at all.

Answer 7

Inlet air leak, pipe off perhaps, but it is a crap car so Rover like performance just aint going to happen is it.

Answer 8

Might be Your technique. Are You letting the clutch out too quickly whilst under-revving?

Answer 9

looks like gasoline clear out or carb situation. replace the clear out first. it relatively is the cheap way. I no treatment, purchase additive to gasoline. clarify what situation is. Small can of product in gasoline. could sparkling up carb. If no sturdy, now time for mechanic. sturdy success.

Answer 10

It's the fuel pump.