Sometimes V8 Somtimes I4
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Pole Position
Joined: Jun 2002
Posts: 398
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From: Brentwood,
Sometimes V8 Somtimes I4
OK i'm stressed out now. Sometimes i go and drive my sc400 and it is pretty kicking, acceleration is as good as it should be. OTHER times it is like i'm driving a stock civic and there is no punch at all when i drop it to the floor. I have 140,000 miles on my car and its a 93. I have used both a fuel system cleaner and an injector cleaner. I have seen no improvements. Do i just need to replace the injectors? The timing belt? Is the exhaust clogged? I'm going crazy somebody help me pleeeeze!
Bluegr*** Performance
Joined: Feb 2002
Posts: 1,532
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From: North Kentuckarolinay
Relativity, at least from Einstonian perspective, relates to an action / reaction type of relationship. This would assign a cause to his intermittent lack of performance. lex400sc: I believe you mean his performance issue is subjective. Meaning, his seat of the pants dyno measures good performance sometimes and poor performance other times, with no scientific means of measuring such.
Neal, it sounds to me like you need a torque converter and a shot of nos. Luxo-autos or automatics in general are notably inconsistent from my experience unless they have been worked over with a shift kit or program and a stall. Of course I know jack about the SC400 so don't quote me on it.
Neal, it sounds to me like you need a torque converter and a shot of nos. Luxo-autos or automatics in general are notably inconsistent from my experience unless they have been worked over with a shift kit or program and a stall. Of course I know jack about the SC400 so don't quote me on it.
Last edited by awj; Aug 20, 2002 at 06:16 PM.
Driver
Joined: Mar 2001
Posts: 117
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From: England
Fuel Pump ECU
If your car just plain wont go when a few seconds before it was running fine then it sounds like you have a fuel pump ecu problem.
If you sometimes have a problem starting the car when its 'warm' then again its a symptom of the fuel pump ecu.
There is a way of 'jumpering' the diagnostic ports on our Soarers (SC400) that forces the fuel pump ecu into the 'high' mode, this cures the problem and prooves if you have a faulty ecu, which should then be replaced.
I cant remember if the same 'fix' works on the SC400.
Though I'm sure we've talked about it on the forum. Worth a search.
If you sometimes have a problem starting the car when its 'warm' then again its a symptom of the fuel pump ecu.
There is a way of 'jumpering' the diagnostic ports on our Soarers (SC400) that forces the fuel pump ecu into the 'high' mode, this cures the problem and prooves if you have a faulty ecu, which should then be replaced.
I cant remember if the same 'fix' works on the SC400.
Though I'm sure we've talked about it on the forum. Worth a search.
For Mind Cruising
Joined: Jan 2002
Posts: 4,766
Likes: 25
From: NSW
I second that!
Check the fuel pump as well. I'm not sure, but the SC400 should have a 2-speed fuel pump... here's an excerp from an FAQ I found...
Hope that helps.
Check the fuel pump as well. I'm not sure, but the SC400 should have a 2-speed fuel pump... here's an excerp from an FAQ I found...
The fuel pump can be forced to operate in the high voltage setting by placing a jumper in the engine diagnostics connector between FP and +B terminals (for location of terminals see the label inside the diagnostics connector cover). A straightened up paper clip can be used as a jumper but must be inserted very deep in the terminals. This function is useful for checking that the fuel pump is not faulty (it can be heard running with the ignition on) and also to make the car mobile in case the fuel pump ECU is faulty. We strongly advise against driving the car for prolonged periods with the jumper inserted as the current draw of the pump in its high setting is about 7.3A and the pump may not have been designed to handle the load permanently and may overheat and seize, creating more (expensive) problems. At idle and under light loads the engine may be running rich due to increased fuel pressure
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