Ok i Am going Crazy here. ive posted this on The Rx7 club and no Help there. I was going 70 down the freeway and It lost Half of the Power in the engine. Its a 1987 N/A 5 Speed. i thought it was My Bad Alt so I replaced it. no dice. one rotor was Lean one was Rich so i replaced the Primary Injectors with New Delphi's stock resistance's and CC's. basically a Oem replacement. Have spark and fuel getting evenly to each rotor. but it wont start. If i Do get it to start it runs like **** and dies after about 5 min of runtime then Refuses to start up again. Please Help

Also The compression is Healthy at 120 per Rotor all 3 Facings

i say change the plugs i always carried around a set in the car just in case.

The Plugs Are Brand New both coils are New. im Thinking its The MAF or the Fuel pump

could be the MAF your right. i would get some cleaner(only for MAF sensors) and spray it out (ONLY THE MAF STUFF) i assume no MSD box? then i would check all the grounds and clean them up. i allways say grounds couse it seems like i allways run into grounding problems. i am allways cleaning and checking the grounds and it still just bit me in the ass a few weeks ago.

Ok i have figured i Have No spark at all ive replaced ALL the relays The Cas The ECU and Its wiring replaced The coils Trailing and Leading Checked and Cleaned ALL Grounds and NO Spark! ive Checked all Ohm and voltage as per the FSM and still no dice all are within specs am i Missing something?

so you got no spark does it sound like it wants to start? try doing the deflood method and see if it helps any

nope don't sound like it wants to start. deflooded 30 times

new injector o rings? is ur cat clogged?

Fuel filter clogged?

If he's got no spark then it's gotta be an electrical issue somewhere. Flooding it isn't going to cut off spark, neither should the MAF for that matter. I'd look for obvious electrical issues, then I would get the multi-meter out and go to town. Did you replace the coil packs before or after the issues started?

Make sure your wires are connected nice and tight also check your battery cables and the battery it self

when i bought the car i had the Primary coil go dead on me i replaced that with one from the junk yard cause lets Face it IT NOT F**** WORTH $900 from the dealer or even 500 from Autozone. i paid $40 from ecology! Phin ive checked checked and rechecked every wire that has to do with the coils the relays fuses and they are All within spec the coils wire from the ecu are all receiving signal from the CAS. how could the Batt /Cables Cause a No spark issue? im not a wiring guru so i have no idea how.

DC needs a ground to complete the circuit, so if something isn't properly grounded, even if you have power to that item it will not complete the circuit. Ground is as important as power itself. If you've tested each component and it's within spec, then my guess is you've got a wiring issue somewhere.



Trust me anyone who's owned a few RX-7's will tell you that they've had a ground cause them a headache on more then one occasion LOL It's one of the first things I do when I get a new RX... run fresh grounds.

How does a bad o2 cause a s13 not to start

ok i will replace the Batt cables and see if i get spark

Lets face it these cars are getting old even if we think there not, lol. Definately check the grounds, look to see if any of the copper in the wire has turned green under the insulation. Don't know why this happens, but its notorious on chevys like cavaliers and old pontiacs. I have replaced/repaired so many wiring harnesses on those. Yeah I know a bit off topic, but it might cheer you up. Even if the ground looks clean, clean it anyways and cover it in vasoline or battery terminal protector(in the spray can). Check your harness where it goes through the firewall. Might find a broken wire there. Good luck

A bad o2 can make it run extremely rich or extremely lean. Not the problem in this case, nor is it the maf, if either of those were correct it would be rich or lean in both rotors, not on rich one lean.



The leading plugs fire together and the trailings fire seperate(or that's how the fd does) so I'd check the trailing ignition circuit. I noticed you didn't mention the ignitor? The fb and fd have one so I'm assuming the fc has one as well. Have you checked that too? If not that could be causing your no fire condition.

How do i Check the Ignitor? i dont have the FSM handy anymore the pages Got thrown away.

I have redone ALL Grounds an i Mean All of them across The entire Harness inside and Out it has to be a Power issue. could there be a Wire under the dash that its Broken?

i did have my ignition wire go out on me

ok i was talking to a Guy who has a 88 and he said there might be a Fusible link some where that went out under that dash are there any?

There's a fuse on the ignition yes, however I think the one that would be the issue in this case would be in the engine compartment.

the main fuse is bolted down on both sides with 10mm bolts and is an 80 amp fuse if i remember right and was 3 bucks

All the fuses in the fuse Box and under the hood are fine. i was Asking if there was one UNDER the Dash somewhere

Does your OEM alarm work correctly? I would suggest bypassing that and see if you have any better luck.

alarm? i didnt know it had one!

Do you not have the security light in the center console? Personally I removed mine and replaced it with another foglight switch.



Here's the wiring. Satch (rx7club.com) can tell you how to bypass it so you can eliminate it as the suspect.

Attachment 16496



***Edit*** After re-reading all of the previous posts I do not believe that your alarm is responsible for your problems. It looks like the alarm disables the starter so I doubt you would be able to get it to turn over if it was the problem.

sure dont lol if it did Come with one it dont have it Now.

I would do a continuity test on the wires from the ignitors to the ecu if thats good ignitors might be jacked up but it is rare for them to go out.

If there is any Member in The Mesa AZ area I need Help!!!!

If you can not find anyone local to help from this forum, you could try rx7club.com or rotarycarclub.com. Post in the regional areas of the forums, and the second gen part. There seems to be more members on those forums than this one, and a better chance a member is in your area.

If you go on the 7club forum look for karack he can help you without and knows these cars very well he rebuilds them all the time he is in vegas now

still no spark? i know your sick of people saying its a ground. but check the ground on the harness up by the ecu. inside the car thin black wire. make sure its on bare metal. if that doesnt work and nothing else has if it was me i would try a new wiring harness. bad harnesses have stumped me twice before

I will Try that and let you know. And where would i Get a NEW harness? Mazda stopped selling them 2 years ago :(

pull one from a junkyard and rebuild or rebuild your own or build your own harness just a couple choices

Ill look at it Tomorrow its Late here