kompressorfed

I've felt my car being slower than normal lately and today when I tried to get on it hard, the car will buck and give me no throttle response for a second and then its back. But nothing close to the power it should have returns to the car.

Now 2 months ago I was having starting problems where it wouldnt crank the first time but would the 2nd or 3rd. I pulled both my fuel pumps up and checked for loose connections, everything was ok. After putting them back in my starting problems were gone and now todays problem starts with the bucking. So my guess is im losing fuel pressure in higher rpms and then the car goes into a limp or safe mode to prevent damage, which is the bucking im experiencing? Any other things to check before I order up new pumps?

tbal

Grab my scan tool and data log, see whats going on with your IATS as far as the loss of power goes. Weathers been hot lately, and on stock cooling it kind of blows...

Have you replaced your crankshaft position sensor? (For starting issues)

kompressorfed

yeah if u free tomm I'll give you a call, anyway to check fuel pressure on it? Replaced my crankshaft pos. sensor last year, was a completely different problem.

ahmad0658

Two things according what I have seen in the forum:

- IC pump
- Catalyst clogged

Could be something else, i am not sure but check first the above.

alexoE55

Same happened to me... most def sounds like the I/C pump... get an aftermarket one dont get the new bosch at stealers... it will happen the same thing.

saleen01

same thing happened to me....i think it depends on how severe the bucking was...wasnt my IC pump as my check engine came on same time, problem seemed to be some sensor in the emmissions system.

kamilclk430

Def the IC Pump. Get the Johnson Pump

Shifter

If its a bad pump won't it just cut out the clutch? Any codes present?

tbal

Alvin didn't just replace the pump? Did you bleed it properly?

AWOL

I had similiar issues awhile back. Dealer diagnosed it as a slight misfire. They recommended new spark plugs or coil packs. I did neither at the time, but by the time they reassembled it after testing, the issue was gone. My suspicion was a loose spark plug wire, so check those first, make sure they're all tight.

tbal

Test the IATs today, they were 100 degrees in the city, 120ish after WOT, and would come back down to 110 range...

Pump seems to be working, supercharger is engaging...

So that possibility is out of the question.

xpl0sive

maf sensor or coil packs sounds like

kompressorfed

Yeah thanks again Tony! My pump was changed to a cm-30 about 3 mths ago and is working good. Before the failing stock pump was showing IATS up to 180. Im gonna check my fuel pressure on the rail tomm, anyone know what it should measure?