2nd Generation Specific 1986-1992 Discussion

3800 Hesitation

Old 06-08-2004, 01:13 AM
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Gmon and I have been trying to fix this for the last 6+ hours.



At or real close to 3800rpms the car just hits a brick wall, feels just like an n/a when the secondaries are unplugged. This happens regardless of pressure, low vacuum or boost.

What we have done:



Direct power to the secondaries and they spray and do not leak. They were cleaned previously; the injectors are not the problem



Checked that the injectors have power when the car is the "on" position



Checked for contiunity on the signal wires for the injectors; check injector cap pins to make sure they are touching, injectors caps are new also. injector wiring is not the problem.



We swapped afms, ecu, pressure sensors, put in a "pill", hooked it up to a direct source.



Added two large grounds to the block. All other grounds are hookedup.





We are stumped as to why this thing hesitates so hard. It will not go past 4k at wot/part throttle. It acts like there is no fuel, like its so lean it just won't go anywhere. I do not know for a fact that the injectors aren't opening.



The car is also running like *** right now for some reason, but thats another post.
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Old 06-08-2004, 01:24 AM
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coils/cas/pressure sensor are within spec. cas wires have contiunity, plugs are firing. Plugs are 1600 miles old. 15k miles on jacobs wires. Fuel filter has been replaced.
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Old 06-08-2004, 02:01 AM
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ill come down and help this week sometime when I get off work, being that I have the same problem. Id be interested in seeing what happens when my haltech goes in, if it stops, maybe its a natural reaction for the stock ecu to go into limp mode under certain conditions with certain mods done to the car. Maybe its a fuel pressure problem???
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Old 06-08-2004, 08:57 AM
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what year is the car? if its 89-91 try plugging in a solenoid into the fpr connector, and clearing the code
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Old 06-08-2004, 11:56 AM
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its an 88.
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Old 06-08-2004, 09:09 PM
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bad omp throwing it into limp mode?
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Old 06-08-2004, 10:35 PM
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Originally Posted by Randomname01' date='Jun 8 2004, 09:09 PM
bad omp throwing it into limp mode?
Thats only on s5 rx7s, this is an s4. which is running premix
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Old 06-09-2004, 10:25 AM
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well that gives me some ideas. I tried plugging the solenoid into fpr connector, but didnt clear codes. I'm also going to block off the omp and go premix, then we'll see what happens. El you should just sell that thing. What was the offer you got? 6k?
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Old 06-09-2004, 01:34 PM
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If the guy comes back around with the money the car is gone no doubt. I should assume I am keeping the car though, and keep on fixing it up.
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Old 06-09-2004, 03:55 PM
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sensor in the bottom of the radiator hooked up?
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