I'm a new owner of a 88 rx-7 and recently the RPMs have been running real low almost like its about to stall and then when I accelerate I feel as if I'm not getting the same power that I used to and at a constant speed the car kinda jerks as if I had it in too high of a gear for that speed. I just replaced the muffler system and I have a new clutch. Does anyone have any idea of what it could be?

Asked by May 19, 2013 at 10:25 AM about the 1988 Mazda RX-7 GXL

Question type: Maintenance & Repair

4 Answers

109,905

I would check the throttle position sensor. Not exactly sure how yours works but most are fed with 5 volts. And the signal wire going back to computer will read from .5 to 1 volt at idle to 4.5 to 5 volts at full throttle. Should be a smooth increase and decrease in voltage as the throttle is moved in either direction. Hope this helps.

92,605

I would check the fuel pressure and supply, you maybe running low fuel pressure or the filter is plugging up.

5,065

Start off with checking for error codes (http://www.fc3spro.com/TECH/HOWTO/ERRORCODES/ZENKI/zerror.html is a good guide, takes some bits but worth the work). If there are no error codes present then check the air filter for clogging and then check for vacuum leaks and for correct ignition timing. If that's not your solution you will need to get the FSM out and check the following things: MAF, auxiliary air port valve, injectors, TPS, MAP sensor, fuel pressure, coolant temperature sensor. If none of those pan out, you may want to check the compression. Personally I would suspect the intake air system as the primary suspect, then the ignition and finally the fuel system. By the way, what sort of exhaust system did you install? It might be the cause of your problems, but normally that is the last item I check because it hardly ever causes trouble unless it's banged up in such a way that it badly restricts exhaust flow.

25

If you changed the exhaust out and didn't change your O2 sensor check that. When I switched to my header in the process of removing the O2 sensor it shorted out on me. It just takes a tap on metal apparently because my brand new one shorted out putting it in as well. Made my 88 run like poop until I got a good one in. I don't have any emissions crap left on mine so I don't run in to the other issues they mention.

Your Answer

Add photo

Related Questions

  • I have a 1990 Mazda RX-7 Turbo, with a 1.3L. My car stalls when I press the clutch when the A/C is on. With it off, it runs great. Any ideas? 1 answer

    I have a 1990 Mazda RX-7 Turbo, with a 1.3L. My car stalls when I press the clutch when the A/C is on. With it off, it runs great. Any ideas?

    1990 Mazda RX-7 Turbo

    -

    Maintenance & Repair

  • 88 mazda rx7 wont run 17 answers

    won't run for more then 20 seconds, and only off of ether at that. all starting and fuel system sensors check out good. any ideas?

    1988 Mazda RX-7

    -

    Maintenance & Repair

  • Rebuild 14 answers

    The rotor tip seals in my fd3s blown the over day. Although the seals themselves are not expensive fittin them is. Does anyone known a cheeper way or maybe somewhere i could get a new or used 13b engi...

    Mazda RX-7

    -

    Maintenance & Repair

  • 1990 FC Non-turbo Fuel/Fuel line problems 29 answers

    I am having trouble with my 1990 FC, Non turbo 13B, fuel doesnt seem to be getting to the engine, although the fuel pumps and injectors are working, the only problem i can see is clogged fuel filters,...

    1990 Mazda RX-7

    -

    Maintenance & Repair

  • hey im new to the wankel i have some questions 9 answers

    Hey ive been podering the idea about the Rx-7 for a long time. proforably the 93 and up body but people frown upon the idea of this vehicle everytime from a tuner aspect. I was wondering if anyone of...

    Mazda RX-7

    -

    Car Customization

RX-7

Looking for a Used RX-7 in your area?

CarGurus has 63 nationwide RX-7 listings and the tools to find you a great deal.

ZIP:

Search Mazda RX-7 Questions

Mazda RX-7 Experts

#1 Lars Cats
Lars Cats
Reputation 370
#2 tennisshoes
tennisshoes
Reputation 130
#3 Tom Demyan
Tom Demyan
Reputation 100
View All

Related Models For Sale

Used Toyota Supra
44 listings starting at $63,800
Used Nissan 240SX
22 listings
Used Ford Mustang
462 Great Deals out of 45,656 listings starting at $1,999
Used Chevrolet Corvette
118 Great Deals out of 20,553 listings starting at $3,000
Used BMW M3
43 Great Deals out of 1,535 listings starting at $5,800

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.