rexib

For a long time I have tried to solve this out:
My TII from 1990 runs in a very jerky mode. When I first noticed the problem the engine only was only loosing power when cornering. I cleened the sock sitting on the fuel pump and the problem was gone for a while. Then it reappeared. I changed the sock and the fuel filter and cleaned the tank as well. It didnīt help. Doing the grounds made no difference either. Now I have the problem all the time - not just when cornering. Power comes, power goes. It is not related to any specific rpm. I checked the ignition cables resistance and they where all the same
(13-14 M ohms). Could the cause be bad spark plugs? I have no iddling problems and no power loss when I reve the engine without load. Do any of you have a suggestion to what the cause of my problem could be?

rolo67

I wish someone would answer this problem...I have the same thing going on with mine!!!

ramses666

iTrader: (1)

Perhaps you have a grounding problem? I added a bunch of them to different places. That might possibly explain an escalating over time issue. Grounds are notoriously bad on these cars.

Ramses666

Craiger

iTrader: (1)

Adding grounds dosn't fix problems!!! The car is suficently grounded from the factory. Follow the instructions here http://www.aaroncake.net/RX-7/grounding.htm if you are having grounding issues.

When you were initially having the issue with it loosing power under cornering, was it more specifically under hard left hand corners with less the 1/4 tank of gas? If so, you were probably just starving the fuel pump of fuel as it is mounted on the left hand side of the tank and in a left turn all the fuel will go to the right side of the tank. If your fuel filters were badly clogged and there was crap in the bottom of the tank, your pump might be shot from any of the crap going through it. Chances are a 20 year old fuel pump will be on the way out anyway. I'd change it and go from there.

P.S. If I am right it would mean you are running dangerously lean so I would either not drive it or drive it gingerly untill you get a new pump.

arghx

iTrader: (3)

if you feel random hesitations in both low and high throttle situations at varying rpm's then you might have bad plugs or wires.

ramses666

iTrader: (1)

Why discount a ground problem? The wrie-up by the mighty Mr. Cake that you quoted makes very clear the fact that 20 year old cars such as ours are vulnerable to grounding problems. Maintaining a properly operating electrical system is vital for a vehicle of this vintage. Just saying that the car is sufficiently grounded from the factory does little justice to Mr. Cake's statements in the link you so thoughtfully provided. Perhaps you should have read the linked post you so gracefully put up for our reading pleasure. if you have electrical gremlins checking grounds could lead to a solution for many people.

Ramses666

well uhhh

he didn't discount the grounding, he just stated a simple fact... Adding ADDITIONAL grounds doesn't help. Cleaning the sufficient factory grounds is what needs to be done. Not trying to speak for anyone or step on anyone's toes here just observing.

HAILERS

Just another series five going into limp mode. What are your diagnostic codes?

Craiger

iTrader: (1)

See below

You hit it bang on the money!!! I couldn't have said it better myself.

Skidtron

iTrader: (1)

Do you have a battery tie down? Are the connections on the battery tight? Next thing is your alternator charging? Test for 13.5-14Volts across the terminals of the battery with the car running. If your alternator is not charging and you've been running off the battery (assuming you haven't drove much yet) then you could be getting weak power to the various components.

I Ask about the battery terminals being good and tight due to g-forces intermittently connecting and disconnecting the power to the car. That could cause what your saying. These things are all very easy to fix obviously.

I doubt your running off just the battery since it seems you've been driving a bit and it would have probably died by now but check the other stuff.

Could also be a faulty coil or igniter as well.

TehMonkay

iTrader: (-1)

I've traced mine thouroghly to being the coolant temp sensor, the primary injector wires, the wires to the coolant temp sensor, or the resistor pack.

Ive had this problem for forever.

rexib

Adjusting TPS made no difference. I checked the resistances of the TPS and the A-B WOT was way to high (12 K, should be around 5!). Then I disconnected the TPS and now the runs great! So I guess that the defect TPS have confused the ECU by sending it erroneous signals. Well, maybe I have a little more turbo lag than before so some day I will buy a new TPS. But right now I dont miss it!