hesitation below 3k.. lack of power above
02-09-06, 10:13 AM
#1
hesitation below 3k.. lack of power above
I put an engine into a second gen n/a 6 port recently. It's having a weird problem though. Below 3k it has a hesitation and a studder, above 3k it seems to rev all the way up, but it seems to be lacking on power. The engine is just past the break in point, and I have the timing set right in. I switched out the coils/plug wires with ones off a turbo 2 at my garage and the problem got a little better, but it is still there. What else could be causing this? The n/a can run on normal 87 octane even though it's ported, right?
BTW it has a few mods, but I don't think that would cause anything
downpipe
midpipe
catback
intake
ported engine
no p/s
no a/c
no OMP (running premix 100:1)
When I put the engine in, I replaced:
o2 sensor
spark plugs
fuel filter
and all the usual fluids
Thanks for your help,
Jesse
BTW it has a few mods, but I don't think that would cause anything
downpipe
midpipe
catback
intake
ported engine
no p/s
no a/c
no OMP (running premix 100:1)
When I put the engine in, I replaced:
o2 sensor
spark plugs
fuel filter
and all the usual fluids
Thanks for your help,
Jesse
02-09-06, 10:26 AM
#2
sounds like a sticky injector (hesitation) and 5th & 6th port activation problem (lack of power up high)
edit: but where does the lack of power start about 5,500-6,000rpm?
and what kind of hesitation is it? a dead spot in the RPM band under 3,000 when you go WOT, or just a rough acceleration?
edit: but where does the lack of power start about 5,500-6,000rpm?
and what kind of hesitation is it? a dead spot in the RPM band under 3,000 when you go WOT, or just a rough acceleration?
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02-09-06, 07:21 PM
#10
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WOT=Wide Open Throttle
You didn't mention what year, so this may or may not be relevant, but- When I got my S5 2nd gen, it ran close to what you mentioned. I found that the 5&6 ports were wired open, and the air pump had been removed. This means the VDI was always closed. Once I put the air pump back on, and got the 5&6 ports and VDI working correctly it ran a lot better at lower RPMs, and had more power throughout the rev range.
You didn't mention what year, so this may or may not be relevant, but- When I got my S5 2nd gen, it ran close to what you mentioned. I found that the 5&6 ports were wired open, and the air pump had been removed. This means the VDI was always closed. Once I put the air pump back on, and got the 5&6 ports and VDI working correctly it ran a lot better at lower RPMs, and had more power throughout the rev range.
02-11-06, 09:05 PM
#12
It's an s5, so yea the vdi is controlled by the air pump, which is still there. It has new plug wires also. We are going to give new injectors a shot, because it probably needs them anyways. I will test out the aux ports when I have the mani off for the injectors. Thanks for all your help!
02-11-06, 11:13 PM
#13
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sounds like it could be ignition to me - how's your spark? did you disconnect the initial set coupler after setting timing? (is that what it's called?) ~rich
02-20-06, 03:33 AM
#14
The spark is good... I tried another set of ignition coils from a turbo 2 at the shop and it didn't change anything. I tried my timing light on all the wires and they are all getting a spark. Also changed the plugs/wires out with some new ones laying around.
ok.... I tried some more things today with this car.....
Replaced all the injectors
Replaced the TPS
Checked the 6ports (they're free enough to turn and the actuators work)
I put it all back together and it still has the problem... I played with the timing some more just to see what would happen.. I put it way out of time and it is almost perfect... wtf? The problem is kind of opposite now... when I floor it, it stumbles, but normal driving is fine. I noticed that the VDI system (double throttles) are taken out of the throttle body, but the 6 port system is still there. Is there any way I could have put the crank pulley on wrong where the timing mark is in the wrong place? I guess I will check it on one of the engines in the shop tomorrow. If I remember correctly, the pulley could only go on one way, but who knows, maybe I messed that up. Man this thing is driving me crazy, lol.
ok.... I tried some more things today with this car.....
Replaced all the injectors
Replaced the TPS
Checked the 6ports (they're free enough to turn and the actuators work)
I put it all back together and it still has the problem... I played with the timing some more just to see what would happen.. I put it way out of time and it is almost perfect... wtf? The problem is kind of opposite now... when I floor it, it stumbles, but normal driving is fine. I noticed that the VDI system (double throttles) are taken out of the throttle body, but the 6 port system is still there. Is there any way I could have put the crank pulley on wrong where the timing mark is in the wrong place? I guess I will check it on one of the engines in the shop tomorrow. If I remember correctly, the pulley could only go on one way, but who knows, maybe I messed that up. Man this thing is driving me crazy, lol.
Last edited by bladz311; 02-20-06 at 03:37 AM.
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