ok so i took out my 86' rx7 n/a for a test run, cuz im gonna be taking it to skool this week. I tried redlining it just to see if it can actually take it, right wen i hit 3-4k rpm it just acts like im hitting a rev limiter or something, is this normal? i swore i could go higher before. I think its because my fuel tank is extremely dirty and i replaced the damn fuel filter. Last one was full of orangeous stuff. I tried wiping the fuel tank down but i cant get much reach to the further back. Do you guys think its cuz my fuel filter is clogged again? How would u guys go upon cleaning the gas tank? i know a place that can flush it for $100 but i dont have that kinda money, im a highschooler

 

Your secondary injectors are not coming on. They kick in at about 3800 rpms. You probably have a grounding issue, boost sensor issue, or the wires connecting the secondary injectors have broken, come loose, corroded, etc. Do a search on the 3800rpm hesitation. You should find lots of suggestions.

Good luck!

 

ahhh hmm i didnt search for the right thing xD thanks for the help, your right on the dot. So its not my in tank fuel filter then eh

 

ok i read that it could be the ground wire, does anyone have a pic or diagram to show me where all the ground is>? i am a dumbass, and im gonna try checking if the clip popped off from the injectors. but how do i "replace" them? do i buy a new wire? reground it like change the whole ground wire ?? im a newb sorry

 

im having a similar problem but im away form the car and my manual right now sorry
if i had my book id scan the diagram for yeah
the rx7 manual is just about my life and i know how yeah feel im a youngen too

 

Was the engine fully warmed up when you tried to do this?
The stock ECU will prevent the car from revving that high when it's cold.


-Ted

 

actually i started it, and let it sit for a while maybe 2 mins, then i just went around my neighbor, then i did a complete stop and tried redlining, then i shifted into 2nd still nothing. It does have a hesitation, like I CANNOT get past 4k rpm at all. I do think it might be my secondary injectors, but i wont be able to find out til i get out of school yeah right now im on a school computer in class. But um is the secondary inject the top ones and the primary below the 2nd's?

 

try this man i had simmilar issues with my 86 fc and this is how i was able to temperarily solve the issue, if your facing the motor lokking at the fan look to your left you see the air pump ok now move to your left till your standing next to the pasenger side fendrt facing the left side of the motor, now see the air pump
follow the air pump till you come along a device bolted onto the side of your motor it will have two syncers coming out of it that plug in just below your radiator fill valve, now unplug those syncers be care ful not to unplug your throtal syncer located on the throtal body , now try starting the car and reving it now it it will goe past all the way to 7 or 8 then it is that device that is faulty for the life of me i cant remember the name of it but it is an emisions control thing suposibly you can take it off along with the air pump

 

cats could me clogged

 

thank you for all your suggestions, i still got about 5-6 more hrs of high school but i will definitely get right on it to find the problem and report back to ya guys

 

if the problem does end up being your injectors i have 4 injectors layin in my garage i bought new ones because i thought they were broken but they werent and if it is the injectors pm me and i let you have them i know how it is being broke in highschool im in my class typing this to. good luck

 

it couldn't be the 5th and 6th port actuators, a friend of mine had this problem and since ours are wired open(compleately removed) that couldn't be it. i think that its the injectors.

 

so much for misinformation!!!

i have 2 friends wtih rx that drove the crap out of their car, and i know for a fact they didnt hit any rev limiter of that sort

 

I second that. While I generally try to avoid reving it high when cold, I have dont it a few times when turning on to a busy street near my house. For some reason, your secondaries arent coming in. Just check the stuff other people posted.

 

ill put swap in a test pipe and see if it makes a difference ive been suspecting clogged cats due to the random backfires that are more and more frequent

 

Hmmm...lesse...when my engine is dead cold, the secondaries will not fire.
I try to exit the parking garage getting off of work during morning rush hour, and it hits a wall.
I get the temps over 140F, and it revs all the way to redline no problem.
What do you think is wrong with my car?


-Ted

 

^^ i dont know, driver not taking care of the car? 3800 hesitation that happens once in a while? concidence maybe?

i park my car outside and it is a little colder here than in hawaii. and there have been times where i was in a rush to school and work. no problems.

sideways 7 didnt have problem.

 

ahhhh i found the solution, *SLAPS FOREHEAD*, haha ok well i finally got home that day of school and opened the hood, lol sorta stupid of me but i realized the injector clips were sitting by the windshieldwipers crevice LOL yeah im very embarrassed to say i forgot to put the clips back in early in the month from testing them. But i still have one problem from my fuel tank. I know it is very very dirty. My fuel filter is clogged i know for a fact cuz i can ehre my fuel pump running hard. I just dont know how to clean the inside, or wat i use to clean the inside. a place is charging 100 but i have no money for that and parents wont give me money for it so anyone know wat i can use to clean the inside of the tank with?

 

if you mean your tank is all rusted up, look into the Por 15 line of products. It did a nice job on my vanagon gas tank

 

yea actually yeah its like rusty, like i pulled it off b4 and drained the tank and theirs orangeous colored stuff i could scrape off like dooky man

 

I apologize in advance for bumping into this thread, espeically on a subject that has already been likely covered time and time again in the forum. (I'm from the 3rd gen forum)

I appear to have the 3800 rpm hesitation on my 86. At first, I thought it was a bad gas tank which was causing debre to clog the fuel filter. We replaced the tank, and we also replaced the fuel filter. We also replaced the fuel pump. This was all last year before I knew about rx7club.com.

I'm thinking it must be a grounding issue, so I'm going to attempt to reground the main points in the engine. If that fails, I'll look at the secondary injectors, they may be closed or something.

Here is the one fact that I don't understand though, and I'm not sure if it's consistent with the standard 3800 rpm hesitation.

When the car does not have a load on it (in neutral) it rev's all the way to redline cleanly and without issue. It's only when I am in gear that I face this hesitation.

Does this detail rule out the ground or injectors not working? I don't know enough about the duty cycles of the 2ndaries as to if they are even needed to get the car to redline w/o load.

Thank you in advance.

(If there are any threads that walk you through the regrounding, just let me know and I'll keep searching)

-Rotary4tw

 

How BklynRX7 cleaned his rusty gunked up gas-tank:

First of all tank of the 2 fuel lines and tape them shut then remove the fuel pump/level sensor access panel

1) used hand pump to remove all present gas and properly dispose of it

2) In well ventilated area reach into open gastank and vacume out all loose materials

3) with wire brush and those copper scouring things from supermarket and scrape scaling and lose rust off of all surfaces in sight, vacume again

4) place hose in gastank and let over flow until overflow runs clear.

5) handpump water out then take pressue washer and blast all reachable surfaces till water fills up, hand pump and repeat 3-4 times

6) over flow till runs clear once more then pump all water out and let dry 2-3 days until inside of tank is dry to the touch

7) while pump is out change the fuel strainer and while your at it, inline fuel pump.

They make tank sealers but i dont trust lining my gas tank with some chemical ****. SO i just replaced the cover, filled up and have been problem free since.

 

New plastic tank. If it can't rust, it won't.

 

That's a royal pain in the *** - I would've just try and find another good, used one.

Doesn't your gas tank have tons of baffles in it?
I know at least the turbo ones all do.
It's almost impossible to get all the nooks and crannies all clean cause of the damn baffles.

hIGGI tried to clean a dirty gas tank, but it was never totally cleaned.
In fact, I know he has pics of a cut up gas tank just to show the baffles in there!


-Ted