yeah i have an 81 with a 12a with 49xxx on the motor and chassis and yeah all of a sudden i have no power , and the overheat exhaust temperatre light was on but from what i know i took a look and there is a lot of air coming out from the intake area i think from the rats nest area. im not sure but im thinking its my rats nest that is ******* up . does anyone have any inpiut... ??? should i just remove the rats nest i was planning just to do it tommorw and see what that does . yeah no power =( okay thanks

 

awesome you blew your motor!



















jk, .... i hope. we need more to go on than that. does it still idle the same? drive the same? just feels weak as hell? how hard is it to crank up? do a compression test!!!

 

nah it cranks up and starts all easily just no power slow revs feels like super bogging shaking a lot when in grear at some points the power comes back for a slipt few seconds then goes back to no power any other opinions could it be the rats nest ?? Seems like a big leak by the carb where the rats next in there seems to be a lot of air pushing out

 

Btw I'm getting sad n scared haha and I'm now drunk and all I can think of is my baby only 48xxx miles man all stockkk please no not yet

 

air pump hose blew off maybe?

 

dude, look around and see if any hose got disconnected? are you sure you are not feeling the "air" from the cooling fan? if the exhaust overheat light came on, i'd check the cat, maybe it clasped all of a sudden...

Alvin

 

Yea I'm daym sure its not the air from the cooling fan I hope it is an air pump I was thinking it was the cat too until I felt all that air well imma gonna look tommorow it was dark so I really couldn't see anything I just felt the air by the carb on the exhaust side thanks for the input any more would be really helpful thanksss

 

ya, rip off all the emissions equipment (unless you're in a CARB STATE) and see if it helps any. besides that, i'd rebuild the carb and see how you're running (i'm drunk and depressed right now)

 

Check around the acv valve.

 

Try changing your air filter or making sure nothing is clogging airflow into the carb...your engine could be starving for air which would lead to an over-rich running condition and the exceptional exhaust temperature (and a sucking noise near the rats nest). It could also be that a catalytic converter has come apart leaving the exhaust partially blocked. Sometimes large pieces of the honeycomb can bounce around and occasionally block the exit of the converter...hit a bump and they might dislodge momentarily. This is a more likely explanation of the sporadic nature of your problem....other than the engine is fried.

 

Verify that you still have spark on your leading ignition before you do anything further...

 

Yea I'm pretty sure I have spark well I started her up again today and started up just fine still no power the choke won't stay I don't know if this is a related issue and the overheat exhaust system is still on I'm more leaning towards my cat fucked but I don't know any other input guys . Oh yea and wheni rev then when it deaccels like it sound really wiered well imma try to take off the cats and hope its that . Thanks any other input is helpful

 

do you actually hear the air flowing?..what about the hose that leads to the check valve at the steel line..(for the cat) is that there or broke?..if you hear air around the front passenger >>air pump..at the back.>>cat and steel line ..couple ideas .

 

something like that happened to me once, i pulled over got out popped the hood and it was a vacuum hose that disconnected behind my carb, seems mazda didn't reinforce some of the hose connections.....just my .02

 

Yup I took one more look at it earlier and I think its the cat I was under and I was revving the motor and seems that all the vibration and noise is someing from the first cat well looks like I'm just going to put a whole new exhaust system haha well hoping that my diagnosis is correct I checked out all your other ideas but it seems to be the cat

 

Well lets seee I took the cat out to hollow it and it wasn't the honey comb type it has like a bunch ot little pebbeles in it so I vaccuumed it out anyways

But I ran it with open header still no power so I went and put it back together and I still have an overheat exhaust system light I am really stumped and really pissing me off any other help is well appreciated

 

did you get both cats? or is your vehicle not equipped... mine was like that when i got it, both cats were solid carbon. but with open header... cant be that.

inspect the ignition timing, Carb. secondaries (its vac.ack)
furthermore, if the exaust overheat sensor is faulty, it may tell the computer to back off on something, or foul something up horribly. just disconnect the sensor and have a spin.. also, is your exaust glowing? if so, then its overheated, and your car needs more attention in that area (glowing cats are cool... sorta)

 

Haha na I don't think they are glowing and another thing while accelerating its shaking like whoaa but when I let off the gas and still in gear no more shaking ahh really pissing me off... and I get power back sometimes for a few seconds but of not its slow in all gears and everything from part throttle to WOT .... And once again its a 81 12a with 48xxx miles everything stockk no mods please helpp me thanks

 

I know that you said you are sure that you have spark on the leading ignition, but until you actually see it with your own eyes I'm going to stick with my original diagnosis.

 

I did some research and looked at some tsb's and I think it might be the acv does anyone have one that is working good for cheap haha I checked mazda trix and it was likw 300 bucks and yea that's really expensive

 

Would I be able to run w/o a acv

 

and another thing if it helps.. on the way home from school today i was trying to go faster but then i noticed if i leave it a WOT for about average of 5 seconds the power comes back .... so i really do0nt know waht it is ?? any more input is well sppreciated thanks

 

Any other input

 

like a few other people said, check the ignition

 

Fuel filter? Anyone.....Anyone...