NoPistons -Mazda Rx7 & Rx8 Rotary Forum

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-   -   part throttle stumbletown usa (https://www.nopistons.com/2nd-generation-specific-17/part-throttle-stumbletown-usa-66989/)

Leetheslacker 08-16-2007 05:04 AM

doesnt matter what i set the tps to it does it



doesnt do it right after starting it, starts happening 1-2 minutes into driving it.

if i redline through some gears it takes a few seconds of holding it at part throttle for it to start bucking.

Leetheslacker 08-16-2007 03:39 PM

fuel leaks fixed

still stumbling.



its fine engine breaking or WOT, but like part throttle keeping any sort of speed just cruising it stumbles and bucks and bleh.

it just makes it a pain in the ass to drive anywhere.



and im basically out of ideas.

guess ill pull the uim and get a look at the injectors, maybe ones halfway clogged i dont know.

Jims554321 08-16-2007 04:31 PM

Try trading out your coil packs, I had the same stumble with my RX7 and it was the ignition.





Also, is everything grounded correctly? Engine Fuse box and ECU? By engine I mean do you have more than that skinny ass wire to the fire wall, a thick battery cable size wire should be run from the bell housing to the frame as well.

Leetheslacker 08-16-2007 05:17 PM


Originally Posted by Jims554321' post='880464' date='Aug 16 2007, 05:31 PM
Try trading out your coil packs, I had the same stumble with my RX7 and it was the ignition.

Also, is everything grounded correctly? Engine Fuse box and ECU? By engine I mean do you have more than that skinny ass wire to the fire wall, a thick battery cable size wire should be run from the bell housing to the frame as well.



have some 6 gauge wire ran everywhere.

from the battery ground int he back (relocated battery), to one of the ecu nuts, through the firewall to the shock tower, motor, and other shock tower, and stock battery ground wire.



it got worse today. went to crank it, started then immidietly died, flooded, eventually got it started. idle is worse, below 1k bouncing feels like its dying, stumbles much harder now, basically like cutting out.

cut out flooring it at high rpms a few times too...





JIMS! i didnt realize that was you. havent seen you round these parts in a while.

Leetheslacker 08-17-2007 12:06 AM

replaced the coils and wires with known good ones.



still there

stumbled a couple times redlining through the gears too.



im stumped.

Leetheslacker 08-17-2007 12:30 AM

gonna go see if i can find the rusty tps and see if that fixes it.

maybe pull the uim and get a look at the injectors.



good thing i have spares of everything cause i seem to be damn near replacing everything trying to track this down.

Leetheslacker 08-17-2007 12:59 AM

one of the uim nuts was loose and one of the primary injectors has a cracked pintle cap. looks like i forgot the spacer that goes between the primary rail and the block.



ill put it back together tomorrow and hopefully itll work.

Leetheslacker 08-17-2007 08:02 PM

replaced the injector with the cracked cap, stumble is gone.



yaaaaay.



im still talking to myself.

Jims554321 08-17-2007 08:06 PM

Excellent!!!



http://www.xsltblog.com/archives/The...urns-Excel.jpg

Aurosting 08-17-2007 09:57 PM

**** my car does that alot it stumbles at crse speed too ...maybe mine are getting clogged too


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