I just bought my first 88 rx7 about 2 weeks ago, all i have done to it is, change the fuel pump strainer, and get the oil changed, but when its idling i will rev up with a little hesitation, but when i put it in gear and try to drive it bogs down unless i barely hit the gas and gradually build up speed, idk whats wrong, im probaly gonna change the plugs and fuel filter, but idk if anyone has had this problem and knows how to fix it

thanks in advance

 

Have you compression tested the engine yet? I'd rule out a blown engine trying to track down a potential fuel delivery or timing problem.

 

mine does similar thing but itll drive fine once i restart it.. CEl comes on and i cant go past 3500 rpms until i shut it off and turn it back on.

 

i changed the plugs today, didnt help, im gonna change the fuel filter tommorow, and get it compression tested, to see if i can find anything out

 

I'd try things in this order:

1) Compression test
2) Check timing with a timing light
3) Inspect AFM plug and test AFM resistance values
4) Check fuel pressure

That's called limp mode, which is an S5 only thing. Your metering oil pump (MOP) is electric, and likely having a problem. When the pump fails, the ECU puts the car into limp mode to prevent engine damage. A side effect of this is the ECU usually has a section burn up at the same time.

Check the engine code to see if it is in fact the MOP: http://www.johnr.com/cpucodes.html.

 

i still havent figured it out, i brought it to a guy yesterday, and he told me the oil metering pump thing, b/c i have a 91 engine, and my ecu wasnt giving us any codes, so i went and got a ecu, and now its not even starting, so idk whats wrong, gonna be a long weekend, gotta get it running by monday

 

Put the original ECU back, and follow the code checking procedure more carefully. If you unplug the ECU or disconnect the battery, all codes will be lost until the problem re-occurs. What you described is definitely limp mode, so you need to confirm. If/when you confirm the pump has stopped working, you'll need a new ECU anyway.

 

ok i got the ecu to give me an error code, it gave me 26 which is the MOP according to that link you sent me, how do i fix it, is there a way to override it and just put oil in the gas everytime, what is the easiest/cheapest way to fix it

 

There is only one way to bypass the MOP and avoid limp mode (without going with a full standalone EMS). You can chip the ECU through Pocketlogger, and remove the code for limp mode: http://www.pocketlogger.com/index.ph...age=1&ecu=S5NA. You'll then need to premix the gas.

Otherwise, you'll need to find a new, working MOP. And you'll need to hope the extra ECU you bought was not damaged when you put it in the car with a non-functional MOP. As I mentioned before, a failed MOP can burn out part of the ECU.

 

Hey guys I have the same problem I think.ill start my car up and it will drive great for about 5 mins then it drives crappy and has no ***** and I shut it off and turn it back on it is fine for a few minutes then back to normal. Any ideas

 

Check the cats, they might be clogged.

 

you might put a guage on your fuel pressure and keep on eye on it while doind a load test

 

Is there any unstable manner/choking/gas smell when trying to rev up after the engine is properly warmed up which don't present when at low rpm/idling?
if so, it's mostly possible to be an inaccurate ignition timing.

 

And check the Water Thermosensor as well if the exhaust checks out okay.

 

Nothing ever gets fixed right when you "need it Right away"!
...
Now,you mentioned a 91 engine in an 88.
Is the engine running as an 88?..or is the Harness FOR the Engine?..Did the Swap entail wiring alterations?..

 

Noticed a loss of power after 4k rpm's and also would not go over 95 mph. I pulled of the catalytic converter and the pre cat was all in pieces in the mid cat. Gutted all 3 cats and no more problem.