12-25-2003
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#1
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Boost Spike
Join Date: Oct 2003
Location: Cottage Grove
Drives: 93 talon Automagickinda....
Posts: 1,116
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ok here goes.... About 2weeks ago my car decided to start acting up. When ever I get on it, build 13psi, and go anywhere above 4000-5000- rpm my motor just quits....I put new plugs....older but better wires than i had in. and now i have a S-afcII but i still dont get it...i want to say its fuel cut but i dont see why it would be other than its cold outside...i have a mbc, 3inch d/p, k&n, rewired fuel pump(stock), blah blah blah any ideas? this is making me go insaine! thanks guys!
Kevin
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91 gsx: 734awhp 593ft lbs, best et 10.4@141, @35psi 1.6 60' 2010
93 Talon: 2011 season: Auto, 8.50 cage, For sale!!! $7500
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12-25-2003
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#2
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Hellbound
Join Date: Nov 2003
Location: St Paul
Posts: 1,390
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What do you mean it quits? It kills completely?
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-Nulli Secundus-
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12-25-2003
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#3
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Boost Spike
Join Date: Oct 2003
Location: Cottage Grove
Drives: 93 talon Automagickinda....
Posts: 1,116
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it feels like fuel cut...its got a nice violent jerk to it....and if i keep it floored it goes no were and keeps cutting in and out.... so i cant accelerate at all
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91 gsx: 734awhp 593ft lbs, best et 10.4@141, @35psi 1.6 60' 2010
93 Talon: 2011 season: Auto, 8.50 cage, For sale!!! $7500
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12-25-2003
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#4
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Sten Sniper
Join Date: Oct 2003
Location: New Hope
Drives: Evo VIII RS
Posts: 1,385
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find some race gas so you can safely lean it out on the AFC. toss that in, lean it out, and try again. If it goes away then it was fuel cut and you need bigger injectors.
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12-25-2003
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#5
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Boost Spike
Join Date: Oct 2003
Location: Cottage Grove
Drives: 93 talon Automagickinda....
Posts: 1,116
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I've been thinking that it might be a head gasket also....colant was full about a week ago... now the upper hose it barrely full.....except the fact that you cant smell or see it through the exhaust system.... so idk its weird...
__________________
91 gsx: 734awhp 593ft lbs, best et 10.4@141, @35psi 1.6 60' 2010
93 Talon: 2011 season: Auto, 8.50 cage, For sale!!! $7500
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12-25-2003
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#6
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Sten Sniper
Join Date: Oct 2003
Location: New Hope
Drives: Evo VIII RS
Posts: 1,385
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Nah....
I mean, im sure you have a blown head gasket, but that wouldnt cause your problem
A lot of times with DSMs (like mine) when the HG goes it doesnt burn coolant, but it pushes it out. The system pressurizes under boost (or whenever, depending on how bad it is) and it gets pushed out the overflow. Empty the overflow and let the car warm up, then do a few pulls. If the overflow is full, then its a HG.
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12-25-2003
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#7
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Boost Spike
Join Date: Oct 2003
Location: Cottage Grove
Drives: 93 talon Automagickinda....
Posts: 1,116
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yeah thats whats been doing on..... i just don't wanna do a hg....im to lazy but i guess i will.. the overflow is overflowing about...lol
__________________
91 gsx: 734awhp 593ft lbs, best et 10.4@141, @35psi 1.6 60' 2010
93 Talon: 2011 season: Auto, 8.50 cage, For sale!!! $7500
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12-25-2003
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#8
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Reynolds number user
Join Date: Oct 2003
Location: grove/tempe
Posts: 3,553
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since you have stock head bolts you can do the lazy method. just take out the bolts, and lift the head up just enough with a cherry picker so that you can slide out the HG, so you don't have to detach anything. then slide a new one in and retorque! do it the dsm way, the lazy way!
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07 Ducati Monster S4R
00 honda elite 50 (64 mph braH!)
05 malaguti F15
04 E55 AMG
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12-29-2003
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#9
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back in the saddle again
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Quote:
Originally posted by gixxer@Dec 25 2003, 08:25 PM
since you have stock head bolts you can do the lazy method. just take out the bolts, and lift the head up just enough with a cherry picker so that you can slide out the HG, so you don't have to detach anything. then slide a new one in and retorque! do it the dsm way, the lazy way!
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i'd recommend doing it right..
or redoing it 3 times.
sounds like fuel cut/mas overrun. I'd try cvd's suggestion or maybe log your hertz value on your afc, if it looks like a 'city skyline' thats mas overrun.
Mas overrun doesn't hit as hard as 'fuel cut' but you can feel the car 'die off'.
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My street car runs low 11's and my race car's personal best is a mid 11....
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12-29-2003
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#10
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Join Date: Aug 2003
Location: Blaine
Posts: 2,789
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i think i had same issues a few times... what does the mass overun mean?
and yeah, if you are going to do it, do it right.. so that you can boost without having to worry, is it going to hold?? do it right or don't do it at all!!!
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12-29-2003
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#11
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formerly ecoli
Join Date: Oct 2003
Location: On the dyno
Posts: 4,892
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MAS overrun is when it's sucking in more air than the MAS can accurately keep count of. It isn't a problem with a 2G MAS until your making 450whp or so. It is a problem much much earlier on a stock 1G MAS. You might have overrun issue at even less than 300whp on a 100% stock 1G MAS, I am not exactly sure when it starts happening. Most people have already at least removed the bottom honeycomb by that time. With just the bottom honeycomb removed I have had it happen in the low 300s. Overrun problems usually seem to start happening around the 2000hz area on the AFC with the 1G MAS.
With a very hacked 1G MAS though you can make well into the 400s or more and keep the hz down low enough to keep overrun from happening. You just don't want to go overboard with the hacking though. Hacking the MAS more than it needs to be can cause some knock/timing tuning problems. You usually only want to hack it to the max if your running a big turbo and injectors that are just big enough for the setup. I had one 14B car with too big of injectors that just removing the bottom honeycomb was enough to cause problems. With a medium amount of airflow signal being removed by the AFC to get the fueling inline and the missing lower honeycomb causing it to measure even less of the actual airflow, the ECU wanted to run the car in an incorrect timing map with way to much timing which ended up making the car knock.
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01-11-2004
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#12
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Boost Spike
Join Date: Oct 2003
Location: Cottage Grove
Drives: 93 talon Automagickinda....
Posts: 1,116
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Figured out that my ecu has a bubbled capasitor... i replaced it but it still runs like it does as described above. But I put a different ecu in and it ran like a champ so i need a new ecu...
__________________
91 gsx: 734awhp 593ft lbs, best et 10.4@141, @35psi 1.6 60' 2010
93 Talon: 2011 season: Auto, 8.50 cage, For sale!!! $7500
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01-11-2004
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#13
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aka Goodbye
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Quote:
Originally posted by santa@Jan 11 2004, 11:21 PM
Figured out that my ecu has a bubbled capasitor... i replaced it but it still runs like it does as described above. But I put a different ecu in and it ran like a champ so i need a new ecu...
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That makes sense. I was having intermittant coil cutout and I traced it down to my TMO ECU. Now it's somebody else's problem since someone decided to remove it from my garage without my knowledge. Hope they figure out it has the security feature.
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2009 Corvette Z51-SOLD
1992 Mitsubishi Eclipse GSX-SOLD
2013 BMW Z4-Current summer hooptie
2017 GMC Yukon-Current winter hooptie
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