1990 NA and when I accellerate it hesitates and will not go above 4500-5000 rpm? New plugs and air filter make no difference. Bonez Hiflow cat a few years ago. Cat? fuel pump/filter? Any ideas? Thanks!
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was the cat specifically for a rotary? rotarys require a different cat than normal pison engines becuase of heat they produce. a clogged cat will defenatly prevent it from reving normally. also it could be the damn 3800 rpm problem that everyone has and since rx7 tach's are not as accurate as they should be... it could possibly be that. when you hit 4000 rpm does the motor change sounds? i.e. when your pulling up to 4000 rpm it sounds like it should sound, then all the sudden the motor just kinda buzzes and the power drops? it just quits pulling sounds and feels kinda like it just slipped into nuetral? if thats what it is doing then its the 3800 problem. my car has this and im fixing it right now.
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Mine seems to be dependant on how much gas pedal I apply. I can get it up to about 5500 rpm but it wheezes and sputters. When I let off on the pedal, it acts normally again. I pulled the plugs and there is a good bit of carbon on them for them being only a week old. Oh, and yes the cat was an rx7 cat but it could still be the culprit I guess. Hate to do it but I think I'm off to the Mazda Mechanic.
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IF this helps solve the puzzle, my line from the airpump to the cat became seperated (no air to cat) and I was forced to drive it for about 40 miles. Would that cook the cat?
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Originally Posted by 1990vert' post='781331' date='Nov 25 2005, 05:02 AM
IF this helps solve the puzzle, my line from the airpump to the cat became seperated (no air to cat) and I was forced to drive it for about 40 miles. Would that cook the cat? nah, that line hardly does anything. is the check engine light on? if not i like the cat |
yeah, sounds like the cat. all that line does is supply air to the cat to burn off all the rest of the unburnt emissions, i doubt driving 40 miles with it off would do that. uh-oh, not the mazda mechanic. they dont even know what theyre doing. well, most of em dont
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So you guys are saying it's the cat? really no way to check the cat is there? I was thinking of getting a RB cat-back. I guess I'll have to add the downpipe and presilencer. I sure hope it's not loud and ricey or I'll be bummed. I prefer to have a close to stock sound. Will I still use the air pump with this configuration?
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Originally Posted by 1990vert' post='781377' date='Nov 25 2005, 10:40 AM
So you guys are saying it's the cat? really no way to check the cat is there? I was thinking of getting a RB cat-back. I guess I'll have to add the downpipe and presilencer. I sure hope it's not loud and ricey or I'll be bummed. I prefer to have a close to stock sound. Will I still use the air pump with this configuration? you can pull the cat off and look in it.... |
I had the same problem, for more or less a year! nobody around here knows how to work on a rotory. n-e-wayz reading a thread one day, to check the injector harness ground, found it it was corroded, cleaned her up, put her back on, and that cured the problem, btw, i tried every other grounding solution people have said on the net, and none of them worked for me, but this one did! GOOD LUCK! https://www.nopistons.com/forums/pub...1047683329.gif
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Besides a clogged cat, 4000rpm sag can be caused by faulty grounds. Check the voltage of all the ECU ground pins... There are probably 3 or 4 of them. They should show -0- volts. If they register a positive voltage then you will probably benefit from running a splice ground to a frame point near the ECU. The secondary injectors kick in at about 4000 too, so you need to check for clogged or leaky injectors and for properly functioning secondary actuators.
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the problems start around 4500-5000. I got under the car today and tapped on the cat (bonez hi flow) and things sounded loose in the cat. This leads me to believe the cat is a good place to start.
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Update, I've put a new fuel filter in it and have inspected the fuel filter in the fuel tank. Have also jumped the ecu ground and still have the problem. I plan to take it to an RX7 guy tomorrow.
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my friend took his car in to mazda because it was running like crap, and we went in and they were on hold for a trouble shoot hotline for rotarys. i thought that was funny.......
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Okay, who ever said it's the cat is correct. I pretty much thought it would be the cat or the secondary injectors. I had a local rotary guru take my car this morning and I just got the call that it's the cat. I am having it raplaced with a single chambered bonez and a racing beat catback. Bad news is that I hear racing beat is not going to have any catbacks for a couple of weeks! I'll keep you posted. Thanks for all of your input, guys.
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Merry Christmas guys. Just an update on my car. Once the cat was found to be partially clogged, I ordered a bonez hiflow cat and racing beat cat back. Unfortunately, RB was slow to get the catback to my shop, Mazsport in Largo FL, so I had to wait nearly a month. In the mean time I had to drive my car a few more times just to get to and from work. It got to where it would just crawl down the road. I could not get more than 3k rpms out of it and 0-60 took about 5 minutes!. Thankfully, the parts arrived at Mazsport friday and the guys were nice enough to put the time into it before closing the shop for the Holidays https://www.nopistons.com/forums/pub...1047683894.gif . My car is an entirely different car. It has got fantastic performance throughout the entire rpm range and more importantly the RB catback sounds excellent. Not fartpipe-like at all. Thanks for the input guys. Now to get the top replaced and the leather seats redone.
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