Revs freely but stumbles under load and in gear.
 

Hello rx7club members, i think i screwed myself over AGAIN..Please help a Beginner rotary enthusiast.
My stock 1990 GXL sat for a month while i did this

First- I had a new "GMB"waterpump installed (Which i found out is bad and messes up the belt aliment) so i threw that out and put the old one back in with new OEM STAT.(Had coolant leak issue) but its fine now.

Second- install new rear speakers but the driver-side was not working so what did my smart self do?*Sarcasm*
Follow the wire a BR/W and BR colored wire all the way to the area next to your clutch foot rest and bypass it. goes to a plug connected to a box. (This is where i think i fucked up and cut something else) (it also has silver marks on it)
i Check the FSM Wiring but i don't trust my incompetent self. i definitely need a experienced voice in this.

Even with the old or the new Pump it kept getting this stumble/ BELT like squeal in neutral when i blip the throttle or try to make it rev quickly in low rpm. From idle to 3000. Sounds come from the front of the engine.
-belts new BTW
- Can rev all the way to red line

UNDER LOAD or in gear is a whole another story! it will STUMBLE, EAT GAS like ice cream on a summers day and not give me any power. SLOW accel. no power. Pulls like its hauling party bus with fat chicks.

I think that's the gist of it. thanks for taking the time to read. I also have my flame suit and my Anti-butthurt power belt on so fire away folks..PLEASE:bowdown:

When in doubt on an S5 you check for error codes for starters.

Ok so tonight i checked for codes and nothing came up. i undid my Handy work on the wiring and will fire it up tomorrow. If it keeps at it ill video it.

Oh and more things to know are.
-Idles and fires up Perfectly
-When driving (after being warmed up) at lights or stop and go traffic the idle drops extremely low and stayed there for quiet a bit until i can drive and get more air into it.(Maybe because its summer)?
-NO problems with Alternator. Battery gets charged

Nope, the car does the exact same thing.
where should i go from here? Could i have thrown the timing off?
should i just go through FSM Procedures? Fuel, Ignition, Timing?

Here's a video if this will help clear things up.


Need anymore info please let me know. i guess for now ill order new fuel filter and ignition coil wires
(sorry bout the video..Its best camera i have right now)

How many miles are on it? Did you check to see if the secondary injectors are firing above 3500 Rpms? It sounds like they may be if it's sucking gas. Also a compression check would be wise. When doing a compression check make sure the shrader valve is out of the tester and watch for the gauge to jump. If it jumps and falls and then jumps again you may have a bad apex seal. That's pretty much the basics. Also check for spark from the coils.

Sounds like its running on 1 rotor.

Finally had some time to get on the 7, plus the fuel filter came in with Coil wires.
Pop them in and the low stumble is now GONE but there is some when rpms are climbing. noticeable around 3-5k. its slight. ill take the car out when i have time for it. Probably this weekend.
untill that happens im going to order a timing light, and a decent multi meter.

@ Andrew falls- it has 113xxx. is that with a piston compression tester or a Mazda rotary engine test? and do you use a multi-meter to test if the secondaries are firing?

3500rpm stumble is usually do to grounds.

@Fuhnortoner I took it out for a guick drive to see how it does under loads..i get stumble only when accelerating at low rpm, idle to about 1500 and when i try to put power down. still eats gas like crazy.
is this still related to grounds? and does this mean im running extremely rich?

Someone told me to try changing the Air Filter and throw in some Injector Cleaner in the gas?

Solved
 

Okay so i went and bought a new fuel sock (i cleaned the old one but i shouldve just bought a new one), new injector seals, and seafoamed the car via gas tank only and finally i have no more low/blip throttle stumble and my power is back!
Plus i think the fuel filter played a part,but it was not even that old. (3 Months)
-i still have that 3-5k slight stumble but ill read up on the grounds and go through them.


i should of done all this before making a thread.:icon_tdow
sorry about that.

Good for you.