Help!!!! No more 4 k rpm`s

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Apr 14, 2010 | 03:38 AM

ReD_devil_Rx-7

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From: Mx

Help!!!! No more 4 k rpm`s

hello friends, lately my rx-7, when driven, I accelerate to 3900 to 4000 rpms, it starts to stop accelerating, the car remains without power, and difficult to get to 5000 rpms. What is the problem that will have the RX-7?

Thanks

Apr 14, 2010 | 03:53 AM

bgbff1205

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From: nj

I have same problem and then it stop turning on and I change the injector the pump filter and it still don't start

Apr 14, 2010 | 11:23 AM

ReD_devil_Rx-7

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From: Mx

Quote:

Originally Posted by bgbff1205

I have same problem and then it stop turning on and I change the injector the pump filter and it still don't start

is similar the problem with my Rx7, its hard to turn on,

what may be? Are the injectors are dirty?

Apr 14, 2010 | 12:04 PM

lastphaseofthis

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From: palmyra Indiana

time to take it to a shop guys.

Apr 14, 2010 | 12:15 PM

bgbff1205

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From: nj

My rx7 did the same then stop turning on I change all. The fuel parts and still no start i m still looking for the problem

Apr 14, 2010 | 01:22 PM

Furb

Rotary and Engineering

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From: Netherlands

no power above 4000rpm: secondairy injectors not firing...? maybe missing spark at high rpm...?

the starting problem is a completely different problem so dont hack this thread!

Apr 14, 2010 | 01:28 PM

Jimmy2222

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Apr 14, 2010 | 01:46 PM

ReD_devil_Rx-7

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From: Mx

RX7 S4 GLX 1986, N/A 129 xxx milles, Mine is to slow to turn on, but the car starts.!!! What would be the problem?

Apr 14, 2010 | 08:25 PM

1SWEET7

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From: CA

Try checking the secondary injector plugs to see if they are on all the way. Sounds like a secondary injector problem.

Apr 15, 2010 | 08:49 AM

#10

satch

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From: tulsa,ok.

Quote:

Originally Posted by ReD_devil_Rx-7

Thanks

One thing to look at are the ECU grounds. Next thing to look at would be the "boost sensor." Pull the hose off the boost sensor with the car running and place your finger over the end of the hose to check for vacuum which should be present. Then cap off the end of the vacuum hose and remove the connector of the TPS and try to get the car over the 4000 rpm hurdle.

Apr 15, 2010 | 08:54 AM

#11

Zerkster

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From: Johnstown Pa

isnt the ~3500 rpm hesitation a normal issue with Fcs. Some are more extreme than others.

I would check all grounds and try running some grounding straps

Good luck

Apr 15, 2010 | 02:58 PM

#12

ericgrau

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From: Huntington Beach, CA

+1 secondary injectors not firing. Usually the injectors themselves are fine and it's the ECU not activating them properly, from bad ECU grounds for example. It's a common issue on FCs but it's not "normal". It's broken.

Apr 15, 2010 | 03:52 PM

#13

Jimmy2222

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From: NL, Canada

Quote:

I have this hesitation whenever I accelerate right around 3500-4000 RPM
The dreaded 3800 RPM hesitation is cause 90% of the time by poor ground connections between the engine, the battery, and the car. Clean or replace all the under hood ground connections. On 86 model year cars , replacing/regrounding the pressure sensor's ground wire has helped (do not re-ground a 87 or later model year). If there is still a problem after that, look at cleaning the fuel injectors and (on a N/A) that your 5th/6th ports are operating correctly.

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