So i have a 88 rx7 na. Just hit 130k. Everything has been change eg. Plugs, wire, oil, tranny, diff, tps, battery.

Was running good for about a month, now all of the sudden it idles funny slight jumpy. On accel it bogs/hesitates untill after about 3k. Mainly does it when cold so i let it sit untill warm before i drive. but once in awhile it does it during normal op-temp.

Any suggestions?

Thanks!

 

Since temperature seems to have a role, I'd suggest checking the water temp sensor. It is located on the back of the water pump housing. The connector may be loose, the pins could be pushed in on the sensor, the contacts could be dirty, or the sensor could just be bad. You can find testing info in the FSM, which is available for download. Links are in the 2nd gen FAQ: https://www.rx7club.com/new-member-rx-7-technical-256/frequently-asked-questions-2nd-generation-rx-7-1986-1992-faq-fc-782402/.

The sensor is used by the ECU to make fuel adjustments. If the signal isn't getting there, or the values are off, the ECU will screw up the mixture.

 

Make sure the TPS is set correctly as well. Temperature can affect the TPS's reading on these cars as well so that could be the issue. Either way, it's always something good to do.

 

ok so its not the temp. outside.

Ive check the sensors the connections seem fine.

Its gotten worse today, i had to rev high to get it going and anything past 3800rps the car runs fine. anything under that it bogs/hesitates.

the idle is not jumpy, and when i rev the exhaust note is very diff. like a fast growling sound i guess.

any other ideas?

 

could the plugs or the wires gone wrong? Its similar to my mr2 T bogging problems and turned out to be the wires.

Im broke but maybe some insight might help from someone.

 

Maybe your primary injectors are dirty since you said anything above 3800 rpm is fine,that's when the secondary's kick in.

 

will fuel injectors work or buy new ones? How much would they go for?

 

Read around saying to check the grounds? Where are they all located?

 

you can usually find used injectors cheap enough. what i might suggest is getting a set and then send them to be cleaned and tested. if you can afford to be without the car for a bit, then you can just send yours.

also, what plugs are you running?