View Full Version : my car starts but runs poorly
maui_boi
09-13-2008, 10:14 PM
my car starts up and everything but dosent keep idle and when i drive it it starts to bog and loss power at 4000rpm anybody got suggestions
Polito Racing
09-13-2008, 10:27 PM
what kind of car is it? does it have any modifications? what exactly is it doing? the idle thing could be a loose vaccum. About the 4000 rpm it sounds like a transition problem since its happening arround where the secondaries kick in. my advices are check your compression on the engine and make sure you have compression on all faces on both rotors, check all your vaccum hoses and get you some starting fluid and carefully and without loosing your eyebrows!!! spray it arround your engine to check for leaks. You will know where the leak is at because the acceleration in the engine will change and run some nice thick ground cables from the shock towers to your engine to see if this help with your hessitation problem. not sure if available on this forum but do a search for 3500rpm hessitation and you'll find what your looking for.
Good luck
Phoenix7
09-13-2008, 10:52 PM
+1^^^
mileage?
When was your last tune up?
How old are the spark plugs?
TPS within specs?
http://www.rotarycarclub.com/showthread.php?t=1790&highlight=factory+service+manual
maui_boi
09-14-2008, 01:58 AM
the car is a 88 n/a with 93k miles we just changed the plugs and the car starts up fine its just dosent want to stay idle when first started it stays after a while of running. for the 4000rpm part it sputters and starts to bog out but still goes and picks up rpm slow like just sputtering and stuff i dunno how to xplain it maybe if i can ill post a video or sound or something to let u guys know if i know how lol
Phoenix7
09-14-2008, 02:05 AM
Tps?
Whizbang
09-14-2008, 08:42 AM
did you look into the condition of the injectors?
maui_boi
09-14-2008, 01:24 PM
not yet but also where is the secondary injectors i dunno where they are or to check it
Phoenix7
09-14-2008, 01:39 PM
did you check the FSM? They're on the top-most rail:
http://foxed.ca/rx7manual/manuals/1988FSM/04a_FUEL_AND_EMISSION_CONTROL_SYSTEMS_NA.pdf
Time to get to work. Let us know what you find out.
maui_boi
09-14-2008, 02:07 PM
where is the TPS
did you look into the condition of the injectors?
+1, check your injectors and get them shipped out to be clean.
maui_boi
09-14-2008, 02:45 PM
but where can i find and check the secondary injectors so i can just get em all one time
but where can i find and check the secondary injectors so i can just get em all one time
Secondary injectors are located on the top of the first bend on the Upper intake manifold. The two injectors located on the outer edges of the runners.
The primaries are buried under the UIM and the UIM will need to be removed for you to gain access to them. Happy hunting!
maui_boi
09-14-2008, 03:03 PM
so the secondarys are on top and the primary is underneath?? on the n/a right?
so the secondarys are on top and the primary is underneath?? on the n/a right?
yup
maui_boi
09-14-2008, 08:10 PM
k i checked all of it and they work and i disconnected the TPS and it idled good just still getting that bad runing at and after 4000rpm
k i checked all of it and they work and i disconnected the TPS and it idled good just still getting that bad runing at and after 4000rpm
You checked the spray pattern on the injectors? You checked to make sure they're firing off correctly?
It honestly sounds like your secondaries are clogged. Pull the rail and injectors, use mechanics wire and read the fsm on how to test the spray pattern on the secondaries.
Whizbang
09-14-2008, 11:39 PM
witchhunter.com
enough said.
maui_boi
09-15-2008, 01:03 AM
well i only cleaned em for now im gonna test it when i have the time i only had time to clean the injectors but i will keep u guys posted cause this car is giving me problems lol
Whizbang
09-15-2008, 09:17 AM
how did you clean them? It requires special tools.
how did you clean them? It requires special tools.
My thoughts exactly.
Usually, and I mean usually; cleaning injectors require ultra sonic bathing, back flowing, and taking measurements throughout the process to ensure that they are flowing properly.
Flow benching the injectors to +/- some percentage and cleaning them until they reach that percentage. You can not just pour in some injector "cleaner" as that only is alcohol, and doesn't really do much of anything... if at all.
You can get injectors semi-cleaned, but that's mostly just fuel system upkeep where they pour in different cleansers through the system. This is not an injector cleaning!
Injectors are sealed units and as such can only be cleaned certain ways as already mentioned.
maui_boi
09-15-2008, 02:23 PM
well then i semi cleaned it then i took them out and dipped em and checked for flow and now we just going c if they click which we neva try yet..wat else could be the problem though??
well then i semi cleaned it then i took them out and dipped em and checked for flow and now we just going c if they click which we neva try yet..wat else could be the problem though??
Dipping them does nothing but remove deposits from the outside of the injectors (and even then it's poor at that). Check the flow and get back to us.
There's no sense in moving forward to another cause until you know that the most likely cause is not it.
maui_boi
09-16-2008, 01:26 AM
it doesn't spray when we jumped them with 12 volts well we couldn't see any sprays...
maui_boi
09-16-2008, 01:28 AM
wat do u think could there be a problem with the plugs?
Phoenix7
09-16-2008, 01:47 AM
send them to KGparts
(http://www.rotarycarclub.com/member.php?u=484)
http://www.injector-rehab.com/
:lol: Love the home page!!!! :lol:
maui_boi
10-13-2008, 05:29 PM
sorrie i havent been on for the longest time but my car starts and runs good now just gotta clean the injectors still yet though cause i can feel it pulling back a little at full throttle but other than that all i did was change the TPS with another cars one and it ran fine after that so im guessing it was a bad TPS
vBulletin® v3.8.4, Copyright ©2000-2025, Jelsoft Enterprises Ltd.