RX7 FD wont rev past 3k RPM!!
#26
Rotary Enthusiast
iTrader: (5)
Coil test
This is how i tested the coils and they were within specs, but i went ahead and swap the leading for fc. My car is single turbo runing 13psi might be pushing 340rwhp on dyno dynamic. I have also hks twin power. The fuel pressure was alarming to me, but the car was still runing, but when i passed 3k rpm would misfire. I also thought that my fpr was bad, but i did the fuel pump rewire and idles better and no misfire.. its like a freaking miracle after testing components. I understand the frustration you are going throug, man.
#29
Hey guys,
No luck so far. Took out the wire loom but couldn't switch it out with a different one because apparently there are differences with the RX7 FD wire loom and the Efini RX7 FD wire loom ....... anyone know this for sure???? I didn't take it out myself, but my mechanic tried it and didn't fit up. Will check through my wire loom in its entirety to see if any wires are broken / bad connections / loose wires etc...
The fight goes on!!! Still working on other aspects of the car as well. Got my wheels already and some other bits are on the way - rotors, SS lines etc... so at least there is SOME progress in other areas
Cheers
No luck so far. Took out the wire loom but couldn't switch it out with a different one because apparently there are differences with the RX7 FD wire loom and the Efini RX7 FD wire loom ....... anyone know this for sure???? I didn't take it out myself, but my mechanic tried it and didn't fit up. Will check through my wire loom in its entirety to see if any wires are broken / bad connections / loose wires etc...
The fight goes on!!! Still working on other aspects of the car as well. Got my wheels already and some other bits are on the way - rotors, SS lines etc... so at least there is SOME progress in other areas
Cheers
#30
Hey Guys,
So after sometime still no progress. Pulled the entire loom out. Checked each wire and plug, all in tact. Got the ECU checked. Checked out fine. No issues there.
Changed the coolant temp sensor. Same issue.
Got the fuel pressure coming from the pump at 82psi which is within range (71.1 - 106 psi according to shop manual). Added an adjustable FPR amd played with that. Still same issue.
Tried two separate coils. Same issue.
I am totally confused at this point and dont know what else to try. Any suggestions? Thanks.
Cheers
So after sometime still no progress. Pulled the entire loom out. Checked each wire and plug, all in tact. Got the ECU checked. Checked out fine. No issues there.
Changed the coolant temp sensor. Same issue.
Got the fuel pressure coming from the pump at 82psi which is within range (71.1 - 106 psi according to shop manual). Added an adjustable FPR amd played with that. Still same issue.
Tried two separate coils. Same issue.
I am totally confused at this point and dont know what else to try. Any suggestions? Thanks.
Cheers
#32
RX-7 Bad Ass
iTrader: (55)
You may want to post some engine bay/rat's nest pictures and maybe a video of it doing it.
Another possibility is something with the secondary injectors, like them being stuck, not firing, bad wiring to them, etc. They come online at 3000 rpm or so.
Dale
Another possibility is something with the secondary injectors, like them being stuck, not firing, bad wiring to them, etc. They come online at 3000 rpm or so.
Dale
#33
I will try to post up some videos and pics soon.
Will also recheck my wiring to the secondaries. I know they are not clogged for sure. Checked both primary and secondary injectors outside the car on a fuel injector machine - cleaning, flow rate etc... and they all checked out good.
Cheers
#35
You can make the computer ignore the limp mode by switching the ignition off and back on without letting the engine stall. Rev it, key off, key back on straight away.
Now you will be able to drive it if is was in limp mode and soon enough you will get fed up of doing this every time you start the car and you will end up buying a stand-alone.
Hope this helps.
Now you will be able to drive it if is was in limp mode and soon enough you will get fed up of doing this every time you start the car and you will end up buying a stand-alone.
Hope this helps.
#36
Thanks for all the replies guys. Appreciate it. Spoke with some RX7 owners in my area and they all seem to think the computer is stuck in limp mode for whatever reason.
I think I might pull the trigger and get a Power FC and take it from there. This whole trouble shooting is getting pointless at this stage. Will order one soon and then post back the results.
Cheers
I think I might pull the trigger and get a Power FC and take it from there. This whole trouble shooting is getting pointless at this stage. Will order one soon and then post back the results.
Cheers
#37
Quick question guys. What's the voltage u guys see to the fuel pump normally? (Non hard wired pump). I am seeing 7.5V at idle. The car idles horribly as stated before. I will be rewiring the pump in short order, but wanted to know if that was normal. When I rev it or at least attempt to rev the engine, the voltage barely goes up to 8V. Or do I have a bad fuel pump resistor (under brake master cylinder)??
Will be ordering the Power FC soon.
Cheers
Will be ordering the Power FC soon.
Cheers
#38
Quick question guys. What's the voltage u guys see to the fuel pump normally? (Non hard wired pump). I am seeing 7.5V at idle. The car idles horribly as stated before. I will be rewiring the pump in short order, but wanted to know if that was normal. When I rev it or at least attempt to rev the engine, the voltage barely goes up to 8V. Or do I have a bad fuel pump resistor (under brake master cylinder)??
Will be ordering the Power FC soon.
Cheers
Will be ordering the Power FC soon.
Cheers
#39
43 yrs of driving My 7's
iTrader: (1)
Before the hard wire mod I did several years ago, I seem to remember I did a voltage check before the hard wire mod. I believe from memory I got around 11 volts at idle and around 12-12.5 with the engine revved. This is about 1.5 volts down from the voltage expected at the battery. 7.5 to 8 volts is definitely low. No way you can maintain your fuel pressure as demand goes up.
Mike
Mike
#43
Full Member
Electrical drain; Maybe clean the grounds. I'm looking at doing this on my next day off.
http://www.dirally.com/forums/showthread.php?15711-My-proof-that-DIY-grounding-kits-work
http://www.dirally.com/forums/showthread.php?15711-My-proof-that-DIY-grounding-kits-work
#44
Electrical drain; Maybe clean the grounds. I'm looking at doing this on my next day off.
My proof that DIY grounding kits work
My proof that DIY grounding kits work
Cheers
#46
Thanks edd956, I have the cat removed and a resonator installed. 3" from the stock downpipe and then a HKS Hi-Power cat back exhaust. Could the resonator be blocked....maybe... but it was thoroughly checked before install. If nothing else seems to work I will recheck the resonator to be sure.
Cheers
#47
Hey guys,
Finally had some time to do some tests on the RX7.
1. Rewired fuel pump as discussed here on the forum and no change. Doesn't seem like a voltage issue to the pump. Even tried a straight wire from the battery terminals to the pump and still no change. Although the car ran slightly better at idle. The car could actually idle long enough to be warmed up to operating temps.
2. Tested the coils finally. The Trailing plugs are firing strong but I get zero spark from either of the Leading plugs. I suspect a dead leading coil and will remove it soon to get it checked properly. I will check all the other coils as well.
Thanks for the help, I will post up any further progress. Will try to remove the coils this week
Cheers
Finally had some time to do some tests on the RX7.
1. Rewired fuel pump as discussed here on the forum and no change. Doesn't seem like a voltage issue to the pump. Even tried a straight wire from the battery terminals to the pump and still no change. Although the car ran slightly better at idle. The car could actually idle long enough to be warmed up to operating temps.
2. Tested the coils finally. The Trailing plugs are firing strong but I get zero spark from either of the Leading plugs. I suspect a dead leading coil and will remove it soon to get it checked properly. I will check all the other coils as well.
Thanks for the help, I will post up any further progress. Will try to remove the coils this week
Cheers