|
|
Thread: starting issues(longish)
|
Mazdarx605
Redlining
Posts: 314
|
posted August 13, 2003 02:33 PM |
|
starting issues(longish)
Hello again guys and gals.Well today after finally putting the intake and carb back on the truck i tried to fire it up.After a short time I got it running but only on the choke.I let it run for a few minutes on the choke and then decided to try taking the the choke off.It died instantly but did re-satret on the choke again.I then figured I should go exchange the jug of prestone 50:50 coolant I bought the other day that was nothing more than water.I then got home filled the radiator up the rest of the way and tried re-starting the truck.Well it would not start not even a cough,with or with out the choke.I tried some more with moving the distributor clockwise and then counter clockwise.Still no go.I thought maybe it was fuel.Well i'm pretty sure i'm getting fuel because the spark plugs are a bit wet.Maybe I flodded it?I did pull the plugs and cleaned them up which didn't help.I played with the idle speed screw and even the idle mixture screw each with negative results.Is there any base line for how many turns out each screw should be?I only ask because i think the PO messed with the settings.Also the truck does not have a points type ignition but also it doesn't have the same sort of distributor as my RX-7.It doesn't have extarnal ignitors like the 7 but the inards look similar how do i check if the dist is working right?Also i pulled the dist out and tried re setting the timing but I'm not sure i'm doing it right.I turned the ecentric shaft pully until the first mark is lined up(clockwise)with the pin ,and then set the marks together on the dist gear and installed it.Is this the proper way?I have the factory shop manual but it goes into the setting for a points type ignition.Sorry to be so long winded but I loved hearing it run,and would love to drive it soon.
Chris
____________
74 green REPU w/factory air
Early production 79 Spark yellow RX-7 GS
|
|
Klaus43
Rotorhead
Posts: 1259
|
posted August 14, 2003 01:19 PM |
|
Best guess:
Those years of 1st-gen electronic ignitions featuring remote-mount igniters--not on the dizzy, that is--were prone to cross-triggering, and assorted other problems. I'd recommend going with the more reliably functional version... Sounds like you may have other issues going on as well, (like fuel?), but there's an important part...
When all is reasonably dealt with, and dialed in to spec--and you're certain as well you have zero vacuum leaks--drag it or push it down the road to start it, before you foul your plugs by extended cranking. Frequently, this is the only way to initially fire 'em up... Set the choke like you normally would, take it up to 25 mph or so, make sure your key is 'on', and pop the clutch in 2nd gear.
|
|
Mazdarx605
Redlining
Posts: 314
|
|
posted August 14, 2003 01:24 PM |
|
Thanks Klaus,
I tried it again this morning and still it starts and runs on the choke but then it dies when the choke kicks off and won't re-start.I was thinking of going with my GSL-SE dizzy with a 2nd gen rx-7 coil and use a wasted spark system if i can figure out how to do it.does this sound like a good idea.Or should i just go with the GSL-SE setup first?It bugs me that it runs but then dies.It has a lot of smoke when it is running which leads me to believe it is running rich.But I'm not sure raelly.I am itching to get this thing going so I can register it and drive it.
Chris
____________
74 green REPU w/factory air
Early production 79 Spark yellow RX-7 GS
|
|
Klaus43
Rotorhead
Posts: 1259
|
posted August 14, 2003 02:31 PM |
|
What color is the smoke?
Lots of potential issues... you know the most about what you've got going on. Hard to dignose from afar...
I'd suggest not mix-and-matching dizzy and coils from different gen's/setups. I'd run the coils from the 1st-gen my dizzy of choice came outta. Unsure as to possible differences with GSL-SE setup due to electronic ignition beyond earlier styles...? Second gen, definitely everything's different...
There's a lot of excellent info. on possible custom ignition setups/methods on other, earlier threads in this forum. Pages and pages to read! DLDFIS, or some such acronyms... Best of success to you! --K.
|
|
Mazdarx605
Redlining
Posts: 314
|
|
posted August 14, 2003 04:38 PM |
|
Hey Klaus
how did you wire the coils from the truck harness?Here is how mine is wired now with a early RX-7 dizzy(ignitors mounted on fender).From the truck harness there is a 6 plug connector with female plugs that I think at one point was plugged into a sub harness.from that i have a wire from the large black lead to the + on lead coil.From the next wire over(yellow w/black tracer)there is a wire to the same terminal of the lead coil.From that + terminal i have a wire jumping to the + on the trail coil.From the trail coil + there is two wires under one ring terminal to the ignitor box.from the 6 plug connector I also have a smaller yellow w/green tracer to the - of the lead terminal.From that terminal there is a yellow wire off to the main harness some where i'm not sure where,and a yellow green to the ignotor box.From the - of the trail coil i have a Blue w/yellow to the ignitor box.From the 6 plug conn i have 2 wires un-used a big Black w/yellow and a brown or red(can't tell)w/white tracer.If I were to go with a 1st gen setup where would i get the powewr for the coils?The 6 plug connector like it seems to be coming from now,or some place else like the fuse block?Sorry to be so long winded but with no wiring diagram that shows the connectors each wire goes to it's tough.
Chris
____________
74 green REPU w/factory air
Early production 79 Spark yellow RX-7 GS
|
|
Klaus43
Rotorhead
Posts: 1259
|
|
posted August 14, 2003 07:23 PM |
|
I'll have to go look...
Wish I had a digicam that was worth a damn, not to mention my Outlook Express functioning, so I could post/export a pic...
I recall there's a plug (6-prong?) that needs to be jumpered between two of the terminals...
Offhand, all the rest sounds about right...
Of course, you do need a hot lead in there somewhere...
I'll have to go look in full daylight tomorrow; better yet, there oughta already be some pics posted in the lengthy ignition threads... ?
|
|
Mazdarx605
Redlining
Posts: 314
|
|
posted August 14, 2003 07:43 PM |
|
Thanks Klaus I will await your findings.I believe the wires from that 6 prong plug are the hot leads.Atleast when i meter between them and ground with the ignition switch on i have 12 volts,and in the tsrat position I have around 9-10 volts which seems right with all the starter drain on the system.
Chris
____________
74 green REPU w/factory air
Early production 79 Spark yellow RX-7 GS
|
|
Klaus43
Rotorhead
Posts: 1259
|
posted August 22, 2003 09:40 AM |
|
Finally, we're back on line...!
How's things going for ya, meantime? I'll try to explain my wiring, if you still need... went and looked; not jumpered, but only using two of the six terminals...
|
|
Mazdarx605
Redlining
Posts: 314
|
|
posted August 22, 2003 09:52 AM |
|
Hey Klaus,
Well in the time the site has been down I have in fact got the truck running on the 1980 RX-7 style ignition it came with when I bought it.I was having poor luck with tuning the carb at first though.It would not really change at all as I was adjusting the idle adjust screw or even the fuel screw that in the manuaul says DO NOT MEDDLE WITH THIS ADJUSTMENT!
Well it had allready been messed with so i did some more adjusting to no avail.I cecked the timing and that was a bit off and set it to about 3-4* BTDC without the vacuum advance hooked up to the motor.The truck idles now around 900-1K with a bit of a miss here and there,and will die at times if revved up and then allowed to drop back to an idle.The float bowl levels are a bit low right now but I doubt that would be causing the engine to die.Also if revved up the engine sort of shakes pretty good and seems like it is either missing bad or running out of fuel around 5K RPM.What could that be?timing?fuel starvation?Is it a good idea to set the timing advanced like i have it without the vacuum advance hooked up?Well I have probably asked too many questions for one reply,but I am very happy the site is up and working again.
Chris
____________
74 green REPU w/factory air
Early production 79 Spark yellow RX-7 GS
|
|
Klaus43
Rotorhead
Posts: 1259
|
posted August 22, 2003 10:30 AM |
Edited By: klaus42 on 22 Aug 2003 10:34
|
Is it running on both rotors?
No problem running without vacuum advance... just make sure the connect to the intake is plugged! 'Misses' could be vacuum leak... could be poor electrical connection...could be dirty fuel/fuel system...perhaps at the igniters themselves? Just been having that issue myself... remarkable, how a little cleaning/adjustment of an electrical connect can make such a HUGE difference! How clean are your plugs? The contacts in your dizzy cap/rotor? How awesome are those plug wires? (Rotaries need all the ignition you can give 'em!) How about that fuel system, tank thru intake...? Timing is important... Sounds like you're on the right track. Clean all; make all 'proper'; go blast it out on the road!
|
|
|
|
