2NDGENKID

please help my car wont run over 4000 rpms. I tried to drive it down the street and i couldn't get the car to run over 4000 grand. it idles fine and will rev up fine. but once i drive down the street it wont go over 4000 grand please help. I live in fenton missouri. i need help please. thanks.

misterstyx69

iTrader: (142)

What Year of RX7 do you have?..Be specific..is it an S4(86-88) or an S5?(1989-91).
the S5's are prone to throwing the ECU into Limp Mode,especially if the Electrical Oil Pump is disconnected or Bad,
let us know,be more specific,and someone here can help~!

blackrotary23

i am having sort of the same problem. it doesnt want to go over 4000. and when i punch it, the rpms just drop like i turned off the car and it backfires and shoots a flame and smells horribly like it is getting too much gas. i checked EVERYTHING! i dont know what it could be. maybe someone will see both of our posts and have some info for us. sorry i couldnt help you.

*TOUCH*

iTrader: (29)

search for "3800 rpm hesitation" or "secondary injectors".....both of you now!

any like styx said (Whats up Styx!) be specific....AKA is it an S4, S5? Turbo, NA? relevant mods??

unren

iTrader: (3)

my car did the same thing a while back. seemed like it would run great till i was driving. wot seemed normal till 4k then it seemed like the engine would hit a brick wall. i ended up cleaning the contacts on my TPS and it has worked fine ever since. funny thing is i didnt even touch anything under the hood for it to start, it just happened out of the blue.

2NDGENKID

The car is a 87 n/a with a atkins rebuilt and rebuilt injectors. It has block off plates and no emisions and no cat. like i said it will idle and rev up fine. it only has a 4000 hesation when it runs with a load . i have checked the tps once with a volt meter and a ohm meter. the tps drops out when your releasing the plunger.

please help thanks for all the help.

drifter_sr

iTrader: (2)

i had this when i was n/a. i cleaned out the tps, and maf and it still did it. but i remember when i was running it i would see a light come on but i couldnt really catch cause i was looking at my cluster to hard. but then i believe it was the C.E.L. but the weird thing was i left my dome light on one drunk night, and it drained my battery. so when i tried to jump it but the battery was bad. (wouldnt hold charge) so then i let it sit from the wensday to the friday when i got paid to buy a new battery. and when i install the new battery it started up fine and i didnt have the problem again. i did a search and found out that when you take terminals off it kind of resets the cpu. then i drove it like that for about 3 months then i did a cosmo swap. but try taking the neg terminal off for like a night and see how that goes. maybe you cpu is throwing a code and it might just reset the cpu. it wont hurt to try.

blackrotary23

i found out what my problem was....the oil metering pump. i used a mechanical instead of electric on a 91 s5 with an 86 swap. come to find out that the connectors need to be connected or somehow grounded so that the car wont go into the retarded state, otherwise known as "limp mode".

*TOUCH*

iTrader: (29)

good eye styx!

2NDGENKID

well im going to try to clean the tps tonight and see what happens. thanks for the help.

FCmidnight Blue 88

you have a problem with ur trail coil an pick up coil i think... i had that problem off and on till i replaced both things.

2NDGENKID

i think i replaced the trailing coil once but ill look in to it and what is a pick up coil

freemanrx7

What is opening your 5/6th ports? DO you have a backpressure tube?

2NDGENKID

i just checked and it has no ports on it at all. but i heard you cant tell to much if they work or not.

blackrotary23

pick up coil is the leading coil right behind the driverside headlight. if your car is not reving over 4000 rpm, then i would check the coil packs leading and trailing. all you have to do is take off the plug wires from the coils and see if they spark when you try to start it. you will of course need two people for this. i am almost 100% sure that you are going to need a new coil or maybe both. let me know if its the leading coil, i have an extra one that i can part with.

2NDGENKID

ok i checked both coils whent he car was runing, and it was sparking from the boot to the sparkplug. what else could cause hesation. when i brought the car it had a hesation around 3500 rpms. but one of the injectors was not hooked up. it never did it agian. and the injectors have been cleaned . so any one with any ideas.

scrip7

iTrader: (6)

My car did this a couple weeks ago. My fuel pressure dropped right around the 4k rpm mark. I pulled the access cover and the pump and found that the pump sock had come off and was laying on the floor of the tank about a foot away from the pump. I went ahead and replaced the sock with a new one and she redlines all the way to 8k now.

SpikeDerailed

iTrader: (7)

*edit* reading comprehension owns me

dvs71990

This is normally associated with dirty or corroded grounds. Primarily the one underneath the intake manifold.

2NDGENKID

i have clean all grounds and added new ones this have the problem. please help me

kborro01

iTrader: (3)

You only need to disconnect the negative terminal for 30 secs to reset the ECU.

2NDGENKID

the battery has been off the car for acouble days. i just went out and started the car. fires up after acouble trys. but still seems to run funny (no power) under a load. any help please.
NO POWER UNDER LOAD.

scrip7

iTrader: (6)

Have you removed/ checked the fuel pump and both filters as you were instructed?

2NDGENKID

the car has a new fuel pump in it but i have not repaced the fuel fitler laterly i guess ill try that next

stuchizik

iTrader: (2)

i had this happen to me 15 years ago with my 86 na. It turns out I was stupid enough to leave my oil checking rag under the hood. It got sucked into the air cleaner and plugged the filter. This probably wont help you but just a reminder to check the simple stuff first. - fuel, air