N/A Chugging Cont (with video)
#26
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Point is, its not due mounts
I mean, I put a spark plug tester between the plug and the wire and i have spark, maybe its not strong enough?
#27
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Connect the timing light to the battery, turn off all of your accesories, insert a wire into the check connector? It's in the fsm exactly what connector you need to jumper, let the car warm up completely. Put the clip on the timing light on the T1 spark plug wire, and aim it at the main pulley by where the pin sticks out of the front cover, pull the trigger and see whats up.
If you can pull your injectors and see if they're clean or not.
The only way you can adjust the mixture is by the screw near the AFM and it only does it for low RPM operation
If you can pull your injectors and see if they're clean or not.
The only way you can adjust the mixture is by the screw near the AFM and it only does it for low RPM operation
#28
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As far as motor mounts, my garage (operating over 30 years ish) told me they pryed at all of them and inspected em visually.
#29
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I can adjust the A/F mixture as well from the variable resistor screw and this seems to directly and only effect the mixture @ idle.
This is what ive gathered from reading the FSM, searching the forums and my recent tinkering.
Correct me if i am wrong,
Cheers
Zip.
P.s. I will take a picture of the screw I am speaking of
#31
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A light flashes when there is spark and you see how far away the mark on the pulley is from the pin on the front cover. Then you turn the CAS to adjust the timing to get them perfectly lined up.
The variable resistor, which is by the MAP sensor and AFM, is what controls the A/F ratio, at idle. The screw that is on top of the throttle body, is the air bypass screw which raises the idle. Adjust the air mixture according to the FSM.
The variable resistor, which is by the MAP sensor and AFM, is what controls the A/F ratio, at idle. The screw that is on top of the throttle body, is the air bypass screw which raises the idle. Adjust the air mixture according to the FSM.
#32
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Bad wire(s)
Bad plug(s)
Bad trailing coil (probably un-related to the chug but as said its why your tach is shot. Three bolts, two plugs - easy to change)
I'd check those out and then move onto spec'ing the pressure sensor and AFM....has someone installed a cone filter on the car lately? Or is it still a factory air box?
And what is on the car for exhaust? Sounds close to stock to me. May there still be a cat in place on the system?
Bad plug(s)
Bad trailing coil (probably un-related to the chug but as said its why your tach is shot. Three bolts, two plugs - easy to change)
I'd check those out and then move onto spec'ing the pressure sensor and AFM....has someone installed a cone filter on the car lately? Or is it still a factory air box?
And what is on the car for exhaust? Sounds close to stock to me. May there still be a cat in place on the system?
#34
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Yes on top of the throttle body right where the intake pipe connects to it there is a bypass screw. My idle does not change when adjusting it, I can adjust my idle seperatly from the variable resistor screw.
As far as motor mounts, my garage (operating over 30 years ish) told me they pryed at all of them and inspected em visually.
what should i be looking for with the light exactly?
Um, im pretty certain the screw im tunring is allowing more/less air into the mixture as it clearly is a bypass screw (as indicated in the FSM) right on the TB after the intake piping,. Since turning it left (lean according to the FSM) alot of the fuel smell is gone and its more powerful.
Thats what the idle bypass screw is for, idle, to bypass more or less air by the throttle plates to allow the engine to idle. This will in no way effect your AFR during cruise or WOT.
I can adjust the A/F mixture as well from the variable resistor screw and this seems to directly and only effect the mixture @ idle
This is what ive gathered from reading the FSM, searching the forums and my recent tinkering
Click on the link below to learn a little bit about idle adjustment and idle AFR adjusment
http://howto.globalvicinity.com/gv_w...i=61&co=1&vi=1
BTW, soft mounts will do this.
Also, when did this start? Does it chug when use light throttle to accelerate? Does the engine skip or chug when you are in neutral or park and quickly going to WOT?
#35
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Mine did something very similar to this.
On my car, the AFM had a tiny dent in the side that caught the flap and held it wide open at all times. Car chugged horribly at low rpms but the smoothed out towards the top end (sounded fairly wicked at idle with dual N1's though. More lope and bass than my '71 vette with 4-inch side pipes).
Anyways - my 2 cents says check out your AFM. Sticking flap causes all sorts of issues, and is an easy fix.
On my car, the AFM had a tiny dent in the side that caught the flap and held it wide open at all times. Car chugged horribly at low rpms but the smoothed out towards the top end (sounded fairly wicked at idle with dual N1's though. More lope and bass than my '71 vette with 4-inch side pipes).
Anyways - my 2 cents says check out your AFM. Sticking flap causes all sorts of issues, and is an easy fix.
#36
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On my car, the AFM had a tiny dent in the side that caught the flap and held it wide open at all times...Anyways - my 2 cents says check out your AFM. Sticking flap causes all sorts of issues, and is an easy fix.
Also, when did this start?
Does it chug when use light throttle to accelerate?
Does the engine skip or chug when you are in neutral or park and quickly going to WOT?
As well I noticed something after you guys told me to check my aux port actuators We looked at them while the car was off, the 'arm' was sticking all the way out of the actuator. We put some grease, and drove it. After we turned the car off, we then went to look at the actuators again. And noticed that this time the 'arm' was 'closed' (not extended). This was odd. actuator is doing two different things. Now weve been constantly looking and its imposible to predict. Its either open or closed when the car shuts off, I know they are moving. I dont know if they are moving properly. Maybe this is my problem?
p.s. thank you guys very much for helping me understand about the idle bypass screw and variable resitor. I realise now where i was misunderstanding things. Thank God and thank you guys for making my rx-7 enthusiasm much more understandable!!!!!!!
Cheers,
Zip
#37
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You mean Air Flow Meter right? like the MAF? I thought you ment air fuel mixture. :-PThis is a sensor is it not? How would i find/check this?
You can read a little bit about a project in progress about converting AFM to MAF
http://howto.globalvicinity.com/gv_w...=120&co=1&vi=1
We have a AFM. Look in the Factory service manual below under Fuel and emmisions.
http://www.teamfc3s.org/main/factory_service_manual/
No If i give the LIGHTEST amount of throttle from a dead stop (i.e less than 1/4) then it will go smothely and very slowly, this is the only way i can drive it now. Once i ease into it and it gets into 2nd gear or even high 1st gear rpms I can floor it and it seems fine. It only is chugging from dead stop generally.
Nope, in neutral or park i can go WOT and it revs up like a bat out of hell. loves it.
As well I noticed something after you guys told me to check my aux port actuators We looked at them while the car was off, the 'arm' was sticking all the way out of the actuator. We put some grease, and drove it. After we turned the car off, we then went to look at the actuators again. And noticed that this time the 'arm' was 'closed' (not extended). This was odd. actuator is doing two different things. Now weve been constantly looking and its imposible to predict. Its either open or closed when the car shuts off, I know they are moving. I dont know if they are moving properly. Maybe this is my problem?
This will not cause your chugging. If they are open at low rpms, this could aggravate the main issue but is not the cause.
p.s. thank you guys very much for helping me understand about the idle bypass screw and variable resitor. I realise now where i was misunderstanding things. Thank God and thank you guys for making my rx-7 enthusiasm much more understandable!!!!!!!
#39
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ok guys, dont bite my head off, but turns out I checked the wrong coil, figures. Had an rx guy take a look at it, he says trailing coil isnt working . I only paid for him to find the problem going to try and fix it myself with a friend.
Never the less he said it is wierd that both of the trailings are not sparking and he thinks the coils might still be good. And dosent think that the 'chugging' is due to that either.
Going to search 'trailing coil' in the forums and see what I come up with.
p.s. is this bad for my car to run like this? as soon as he told me I drove home and stopped driving, Im scared.
Cheers
Zip
Never the less he said it is wierd that both of the trailings are not sparking and he thinks the coils might still be good. And dosent think that the 'chugging' is due to that either.
Going to search 'trailing coil' in the forums and see what I come up with.
p.s. is this bad for my car to run like this? as soon as he told me I drove home and stopped driving, Im scared.
Cheers
Zip
Last edited by ziplock; 05-19-07 at 10:59 PM.
#40
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I think the trailing coils use one igniter for both. I can't be sure though. I would have to look at the FSM.
The trailing is like a clean up coil. The leading coils are the one you can not run the engine without. It wont start. You will loose power without trailing firing but thats about it.
At least im not the only one that knows the ignition is not the cause of the chugging
The trailing is like a clean up coil. The leading coils are the one you can not run the engine without. It wont start. You will loose power without trailing firing but thats about it.
At least im not the only one that knows the ignition is not the cause of the chugging
#41
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ok trying to understand the fsm, says i need an 'igniter checker', so confused here, dont wanna have to replace the coils if they arent broken. Not 100% sure how im supposed to check em. gotta work now, will do some readin there.
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