91' problems
#1
rx7freek
Thread Starter
91' problems
Hey guys, I have a 1991 s5 vert. She will start fine. Idles where it should and the throttle responds quite well while in neutral. However, once I get moving, and I put the throttle down, the check engine light comes on and the engine will then practically do nothing. Any ideas on what the issue could be?
thanks in advance
-RX7FREEK-
thanks in advance
-RX7FREEK-
#2
Top Down, Boost Up
iTrader: (7)
Check for what code(s) it's throwing. My guess would be 20, 26, 27 or 30, which are related to the MOP/OMP. Your symptoms sound like limp mode, which is the fail-safe mode when the pump fails. The solution requires a new pump, and in many cases a new ECU. The ECU can be damaged by pump failure.
http://www.johnr.com/cpucodes.html
http://www.johnr.com/cpucodes.html
#5
rx7freek
Thread Starter
Okay, so after taking her to the local overpriced Mazda dealership (lol) I was told that the OMP and TPS were bad. so I bought used ones off of ebay and installed both. The problem still persists. any ideas?
#7
Moderator
iTrader: (1)
http://www.banzai-racing.com/FD&S5_error_codes.htm
If the car runs smoothly above 4000 rpm then you need to check the TPS plus the primary injectors as the primaries are the only injectors which work below 3800 rpm.
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#9
rx7freek
Thread Starter
So, a bit of an update. I failed to mention previously that when idling, the engine will rev to around 1000 and drop to around 800. This happens in around the course of 1 or 2so seconds. This will happen repeatedly until I apply some throttle. Around 3000+ it will run smoothly.
#10
Moderator
iTrader: (1)
So, a bit of an update. I failed to mention previously that when idling, the engine will rev to around 1000 and drop to around 800. This happens in around the course of 1 or 2so seconds. This will happen repeatedly until I apply some throttle. Around 3000+ it will run smoothly.
#12
rx7freek
Thread Starter
Forgive me for my ignorance, But how would I set my TPS to spec? (assuming the TPS is any good) Also, how would I check for a dead spot in the resistance sweep? And if one is found, how would I go about resolving this problem?
Thanks
-RX7FREEK-
Thanks
-RX7FREEK-
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