whats up i just bought a 87 mazda rx7 gxl it ran great i love the car but for some reason i have lost a lot of power and my shift light comes on at 4 grand and stays on even when i floor it when i let off of it a little the light goes out like it should i have tested the tps could it b a bad ecu or something like that please help me i love my mazda https://www.rx7club.com/images/smilies/icon_no2.gif

 

Go into more detail on the power loss you're experiencing. As a start, you should pull engine codes to see if any sensors are malfunctioning. http://www.teamfc3s.org/info/article...odes/main.html.

 

thanks for that info im on the way to auto zone i will let u know what happens thanks

 

ok i went and tested my ecu and every thing is ok i wired my 5th and 6th ports open and no difference shift light comes on still i have put a lot of time in to fixing this with no luck
i tested my tps and crank sensor and coil packs all good could it b a bad ecu also ran carb cleaner it runs great under 4 grand its like i have lost 50 percent power and i can only think it got to be something with the shift light coming on
do u know if that light it directly connects to the ecu

 

Make sure the boost sensor is plugged in.

Check the condition of your grounds: http://www.aaroncake.net/rx-7/grounding.htm

Clogged cats?

When was the last time the fuel filter was changed?

Secondary injectors unplugged?

 

The shift up light is ECU controlled, but it's not a symptom of anything I've heard of or seen personally. It comes on when shifting would be best for fuel economy. The controlling factors are gear, RPM & throttle position.

Check out the things Aaron listed. Cats can be inspected visually; look for fused opening or broken pieces rattling around. The secondary injectors can be tested with a multimeter either at the ECU (pin outs in the manual), or at the injector plugs themselves. You should see 12V on them. Since they come on at 3800 RPM, they'd be the first thing I would check.

 

injectors are plug in and boost sensor is to i think my cats are fine my car has a new fuel tank and pump and filter i will work on the grounds and can u tell me if the shift light is direct plug in to the ecu or does it work off of the boost sensor Do the second injectors come on at 3800 or do they stay on all the time i have done a battery post conversion to the gold clamps slitely better o yea in the morning when i leave the first pull from first to second the light wont come on till 5 grand only one time when i pull out of my drive way then it lights up at 4 grand all the time i have power under 4 but hardly nothing above 4 it runs ok when i feather the gas with the rpm of the motor but still no power like it was

 

word i did not know that the secondary injectors came on at a certan point in the rpm am going to check then first before i do the ground thanks for the help guys i will let u know what happens

 

hey i just got done with the grounding it runs so much better i tested my boost sensor and i think its the prob 0.08 volts all the time it should be at 3.5 to 4.5 the book says so if
i could got one for a decent price How much does that boost sensor go for

THANKS FOR THE HELP GUYS WHEN I GET IT I WILL REPLY WITH THE NEWS

 

does the 91 N/A come with a shift light???