S5 turbo is going into limp mode, can anyone give a complete list of the possible causes, the car doesn't throw codes cause its a chop job.
NOte there is no mention of the safe mode anywhere in the FSM for some reason, no?
As far as I know the items that will trigger it are: OMP, TPS. AFM, ...

 

Most likely the OMP.

 

The free, online Series five FSM, in the FUEL section, gives you the results of what happens when each sensor is *broken*.

 

1300cc.com has a list of CEL codes, that will tell you what causes limp mode as well.

 

Hailers got a link ?

 

https://www.rx7club.com/forum/showthread.php?t=494667

They're under MANUALS AND LINKS.

Just download the FUEL AND EMISSIONS section for the series five models.

 

lists of causes that causes limp mode?

its a big list... u ready?


1. EMOP


<end>

 

And the AFM too, but it's usually the OMP.

As always, check for error codes first...

http://www.johnr.com/cpucodes.html

 

ok this thread is NOT dead... first of all there is NO list of safe mode causes in the FSM, only that the ECU goes into a default setting for each bad feedback signal it recieves from whatever system on the car. In some cases, such as a bad O2 sensor, it appears that the ECU will fail to to rich of a mixture, for instance.
I still have not heard the definative list of causes for the safe-mode total fuel cut that many folks have had at around 4k rpm or less under load.... from what I have heard here the OMP is the only reason for the ECU to cut power totally... (it feels pretty violent) and usually causes severe bucking.... Both mine and my mechanics car have this problem, his definatley has a bad OMP and needs the box tweaked at the place that does that somewhere, but they don't offer the tweak for the turbo yet. I guess its got to be the OMP on my car also,
as I mentioned my car doesnt' throw codes... its a hack job. At least we tried to get codes, the ECU isn't connected to the dash panel so the voltmeter method doesnt seem to work.
thanks anyway fellows will check in next week.
BTW I looked for section "D" in the FSM where there is supposedly an explanation of safe mode and the OMP couln't find it.

 

Nah. If you look in the FSM in the Fuel Section you'll find a section called Input/Outputs and a similar page that I can't remember right now, but on one of those pages it shows what items effect each other.

Then there's the CONTROL UNIT page, which is more useful than most things in the FSM. Get a meter out and check each ECU pin with the key to ON and engine at idle and see if your car meets the basic criteria of the FSM.

IF the boost is over the stock settings, the ECU will cut fuel to the rear rotor housings during boost. The secondarys come online at 3800rpm plus LOAD, so take that into consideration along with fuel possibly being cut to the rear rotor as your problem.

In the Archeives on this forum is a item by Paul Stoakes on how to make a fuel cut defender. In that article he explains FUEL CUT during boost. http://www.teamfc3s.org/info/articles/fcd/diy_fcd.htm

The 02 sensor or lack of one working has zippity noticable effect on a car. The engine just will not go into closed loop while cruising. NOT a player in your case at all.

Section D gives you a list of ohm checks to see if the OMP is good/bad. Do it.

IF your car will go to six/seven grand under low load conditions, then it is not going in to LIMP mode. Someone just made that term up. You won't find it in a RX FSM.

Explain hack job. It's a series five car. Right?????? Series five na with turbo swap???????

Don't need no codes to fix my car. I've a cheap digital meter and a FSM. That's all one needs.

I suspect your experiencing FUEL CUT due to no fuel cut defender.

 

You need to look a little closed at the info provided. It's not particularly clear, but then it's written for people who service cars for a living an see stuff like this regularly. For error codes 08 (AFM), 20 (OMP position sensor), 27 (OMP) and 37 (OMP/battery voltage) the fail-safe function is "Basic fuel injection amount and fixed ignition timing", which basically means limp mode.

It doesn't say that. I don't know why people think that's what happens...

I agree with Hailers, sounds like overboost fuel cut at 8.6psi. Is that when it happens? Do you have a FCD?

 

you guys aren't going to believe this one. Its a slammed 88 vert with an S5 stock turbo setup. We go it all to go. It cooks. It was hitting the limp mode because of some lack of feedback signal from the clock panel. We ran the codes like all you guys said and tweaked it fine. What a project!
Now I have all the wire color codes for the S4-5 morph and all the other jumper wires etc. for a shoe in. And guess what? It runs fine w the stock fuel pump...(for testing) and the original hood fits on too, she gets hot under there quick tho
sseee you gaaazzzzz

 

I mean got it all to go, and we have the wire color patches from the 4-5 so you can just buy a JDM engine and ECU and put it in your S4.... No **** I just did this, its quite a bit of wiring but it beats chopping up a perfectly good engine.
I'm not sure quite how much to charge everyone for the plans, maybe fifty bucks would do her.
its worth it.
JW ex RX7 racer

 

pretty much all you have to do is a bunch of splicing near the ECU theres plenty of slack in the harness and its no prob
PM me for the schematics

 

S4-5turbo conversion electrical schematics
PM me or apexco@juno.com

 

S4-S5 turbo electrical conversion harness schematics
JDM conversion

 

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Not that hard to believe. The problem is most swappers that post don't have the ability/knowledge how to rewire the series five EM harness to the stock series four Front' harness. They probably have the smarts to learn how but for various reasons just don't wanna learn how.

Seems your intercooler isn't doing the engine much good with no airflow across it.

 

There is no "feedback signal from the clock panel" to anything. Whatever the problem was, it was nothing to do with that.