Hesitation
#1
Scooby Regular
Thread Starter
Hesitation
Hi All,
I'm getting a Hesitation on my forged 2.1. Don't notice it when the engine is cold, once fully warmed up is where I notice it.
Basically the issue happens with a quick change of throttle position, so cruising along at 40mph or so, give the throttle a stab, you get a stutter, hear a pop then it pulls fine and cleanly. Coming off and onto the throttle does the same thing. It doesn't do it all the time.
You can recreate it revving it at idle too, blipping the throttle to hold 2500rpm or so.
Any ideas?
O2 Sensor is less than 6 months old and Denso. MAF is original to the car (2003) and has been cleaned within the last 4 months.
Cheers,
Scott
I'm getting a Hesitation on my forged 2.1. Don't notice it when the engine is cold, once fully warmed up is where I notice it.
Basically the issue happens with a quick change of throttle position, so cruising along at 40mph or so, give the throttle a stab, you get a stutter, hear a pop then it pulls fine and cleanly. Coming off and onto the throttle does the same thing. It doesn't do it all the time.
You can recreate it revving it at idle too, blipping the throttle to hold 2500rpm or so.
Any ideas?
O2 Sensor is less than 6 months old and Denso. MAF is original to the car (2003) and has been cleaned within the last 4 months.
Cheers,
Scott
#7
Scooby Regular
Thread Starter
TB is clean, or was when I built the engine. Not checked the ICV. Just seems odd how it only really happens when the car is fully warmed up.
I might run some logs on it to check the injector timings and AFR's when it happens. I think its lean, like the injectors haven't caught on that you want to get moving, then they catch up.
I might run some logs on it to check the injector timings and AFR's when it happens. I think its lean, like the injectors haven't caught on that you want to get moving, then they catch up.
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#11
Scooby Regular
Thread Starter
Its Newage so coil on plug. I'll pull the plugs out this weekend and have a look at them. They are only a few weeks old, NGK BKR7EIX.
If feels like fueling though as it hesitates / Bogs, then pulls fine.
Another thing I wanted to do was check my fuel pressure.
If feels like fueling though as it hesitates / Bogs, then pulls fine.
Another thing I wanted to do was check my fuel pressure.
#13
Scooby Regular
Thread Starter
Should be, replaced that within the last 8 months too with OEM.
I think its one of the following:
Air / Vac leak
MAF
MAP Sensor
TPS
Injector timing
But why it only happens when the car is nice and hot I have no idea. If you drive it hard and get it nice and warm it starts doing it. Then go easy for a few miles and let things cool off and it gets a lot better again.
I think its one of the following:
Air / Vac leak
MAF
MAP Sensor
TPS
Injector timing
But why it only happens when the car is nice and hot I have no idea. If you drive it hard and get it nice and warm it starts doing it. Then go easy for a few miles and let things cool off and it gets a lot better again.
#17
Scooby Regular
Thread Starter
It would be handy if it threw a misfire code though, but i'm getting no CEL at all.
#20
Scooby Regular
Thread Starter
Couple of other things I've noticed, cruising along at say 30mph at constant throttle, the car feels like its pulsing, like you're very slightly pumping the throttle up and down.
The idle is slightly off, you can hear it change rpm very slightly like the load on the engine is changing. Needle doesn't move though.
And when it bogs / hesitates you can hear induction noise quite loudly like an N/A car which is then followed by a pop and forward thrust (Happens very quickly though)!
The idle is slightly off, you can hear it change rpm very slightly like the load on the engine is changing. Needle doesn't move though.
And when it bogs / hesitates you can hear induction noise quite loudly like an N/A car which is then followed by a pop and forward thrust (Happens very quickly though)!
#24
Scooby Regular
Thread Starter
Yeah I cleaned that out a while ago. The engine has only been in since September last year. Also it doesn't seem to matter what RPM you're at it either.
Weather makes no difference either. I'm going to tear it to pieces at the weekend, pull the plugs, check the coilpacks, compression test it etc etc.
Weather makes no difference either. I'm going to tear it to pieces at the weekend, pull the plugs, check the coilpacks, compression test it etc etc.
#26
Scooby Regular
iTrader: (5)
Is the car equiped with avcs? A faulty nps can cause all kinds of troubles like this.
If its happening at higher temps my money is on ignition, even though its got newage coilpacks they are getting old and the one near the up pipe has had a hard life.
As a test befor you pull it apart you could pipe the wastegate actuater up directly so it only boosts to half and rule out the spark being blown out.
If its happening at higher temps my money is on ignition, even though its got newage coilpacks they are getting old and the one near the up pipe has had a hard life.
As a test befor you pull it apart you could pipe the wastegate actuater up directly so it only boosts to half and rule out the spark being blown out.
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