Rx-7$4$me

Hey everyone, when my car is warming up,
after I first start it overnight or somthing, I will get stuttering and hesitation when its under 3k rpms, it will start to hesitate, be fine, hesitate, fine, and I noticed this in 4th gear about 2krpms.

Then, sometimes when I drive her around, ( im not sure if its warmed up when it happens, I'll check next time), only in first gear, I will be climbing up the the rpms under 3k, and I get a HUGE hesitation, usually before the 3k rpm hesitation, I mean like fuel cut at like 2k rpms. I was thinking maybe it had somthing to do with my primary injectors?
Double throttle sticking while warming up?

Grounding problemo?

Any ideas anyone?

Steve

efiniracing

Could be a ground problem, or a bad knock sensor. Try grounding your car 1st since it's cheaper. Have you done a battery relocation?

speeddemon7

Hey its probably your trailing ignition coils.I had the same problem.Under light throttle the car would buck.Meaning hesitation,no hesitation,hesitation,no hesitation.But under heavy throttle it would go away.
Then one day I started the car and it wouldnt even drive worth a damn.Because the engine was flooding.
The flooding was caused by the fact that the trailing coils werent firing.So the leading coil was doing all the work.If you know how a rotary works youll know that the leading and trailing spark plugs fire off in the same cylinder of the the rotor.Granted its a rotary engine but each rotor has 3 firing chambers.For a total of six.So picture the firing chamber with two spark plugs firing.The botom is the leading and the top is the trailing.If the top or bottom doesnt fire.Youll get too much fuel not enough spark.Hence flooding.
The end result is bucking.
Test your coils with an ohm meter.The reading should be below 1.0 ohm's for all the coils.If you havent done so already look on ebay for the dealership service manuals.If you have an rx 7 you will grow to depend on them.The manuals will show you how to test each coils resistance.My leading coils were ok but the trailing werent withing tolerance.
Believe me it took a long time to figure out the problem and even more money.I changed all my vacuum hoses all the solenoids,new fuel pressure regulator ,all new injectors and a new fuel filter.Still didnt fix the problem.
Changed the coils.And bam.Problem solved.

Rx-7$4$me

Sweet, thanks for the idea...

But it only happens when the car is has not reached 175-180 degrees, and then occasionally in first gear, which might have been when it was cold still, I cant remember. So if its still cold, could it be somthing else?

Steve

BigIslandSevens

iTrader: (4)

Whats up dude! I would lean towards DT not operating correctly. Put vac. to the actuator and see if it pulls in. Start car and see if there is vac. present at the hose. Watch the engine warm up, the actuator rod should be in while it is warming up. It SHOULD oush out when the engine reaches safe operating temps.(no vac. present at hose when engine is at oper. temps.) I bet you already knew this but it sounds close. espeacially since you mentioned it doesn't happen after 175-180 degree's Good luck!

Rx-7$4$me

Yeah, I think im gonna check that out and make some new grounds anyway.

Hey man are you on AIM or anything?

BigIslandSevens

iTrader: (4)

Sorry to sound stupid What is AIM? Aol instant message?

Rx-7$4$me

yah

BigIslandSevens

iTrader: (4)

yep! I believe it is Rotoryhead. My buddy in vegas gets me I believe that is what it is.