I smell exhaust and hesitation problem
02-20-07, 07:53 PM
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I smell exhaust and hesitation problem
I just bought my second 7. THis one is a 88T2 with 102K, fully stock with a drop in K&N. THe first problem is that it hesitates from 5K RPM on. When I get to 5K it hesitates a little but keeps going. When I hit 6K its like it hit a brick wall, it will not go any farther. I put in new NGK plugs and it still does it. The turbo seems to be working fine the whole time. I have searched but I only found hesiation fixes for N/A engines. Do you think it could be a fuel problem?
The second problem I have is that I smell the ehaust when I roll my windows down doing 65 MPH or more. What do you think it is? I really need to figure it out before summer cause my A/C doesnt work.
Any help would be greatly appreciated!
The second problem I have is that I smell the ehaust when I roll my windows down doing 65 MPH or more. What do you think it is? I really need to figure it out before summer cause my A/C doesnt work.
Any help would be greatly appreciated!
02-21-07, 03:06 AM
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the exhaust smell is probably due to either the rear hatch seal leaking or maybe the rubber shifter boots leaking. opening the windows creates enough vacuum to suck the exhuast in through either of those places. I have same problem. mine is actually due to both the hatch seal leaking and the rubber shifter boot being torn all to hell...
02-21-07, 03:39 AM
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yea my cousin has the hesitation problem at higher rpms on his 88 t2 when we were trying to figure out what was going on, we came to the conclusion that it might be his secondary injectors crapping out.
Also about the smog problem, he has no shifter bushings and his boot is all messed up and a lot of smog does come through there so you should probably look into that
Also about the smog problem, he has no shifter bushings and his boot is all messed up and a lot of smog does come through there so you should probably look into that
02-21-07, 04:50 PM
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You smell exhaust? Welcome to owning a RX7 dude. lol
And most hesitations are caused by grounding issues. Check/resolder your grounds or go and get a ground kit.
And most hesitations are caused by grounding issues. Check/resolder your grounds or go and get a ground kit.
02-21-07, 05:18 PM
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I just took my car to the shop to get a diagnostic. It turns out there was a factory recall in 1989 on the AFM and mine was never changed. I am going to call Mazda to see if that is something that can still be fixed, I doubt it though.
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02-22-07, 06:59 AM
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It could be fuel cut. Thats what it feels like. Just for the hell of it I had my fuel pressure checked and it was fine. I'll just check with the dealer first and see if I can get the AFM replaced under the recall. If it does get replaced and it still does it, its probably the fuel being cut.
02-23-07, 08:07 AM
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http://www.aaroncake.net/RX-7/grounding.htm
From his site
5. Additional Grounds
I know at the beginning of the article I ranted about adding unnecessary grounds. As it turns out, there is one location where an additional ground can be very beneficial. If you are experiencing the notorious 3800 RPM hesitation, adding an additional ground to your boost/pressure sensor is a known cure that seems to be effective most of the time. Remove and clean the boost/pressure sensor plug as described above. Thoroughly clean both the sensor and harness contacts with contact cleaner. Locate the ground wire (this is the brown/black wire on '86-'88 cars, and the black wire on '89-'92 cars) and separate it slightly from the harness. Cut it, then strip both ends a little. When you cut make sure to leave ample room on both ends. Slip some adhesive lined heat-shrink tubing over one end before twisting both ends back together with an additional third wire. Solder the connection, cover with dielectric grease and then use the heatshrink tubing to seal it. Now run this third wire along the harness to either a good body ground or (preferably) the ECU ground on top of the engine. This essentially regrounds all the engine sensors except the O2 and knock sensor.
From his site
5. Additional Grounds
I know at the beginning of the article I ranted about adding unnecessary grounds. As it turns out, there is one location where an additional ground can be very beneficial. If you are experiencing the notorious 3800 RPM hesitation, adding an additional ground to your boost/pressure sensor is a known cure that seems to be effective most of the time. Remove and clean the boost/pressure sensor plug as described above. Thoroughly clean both the sensor and harness contacts with contact cleaner. Locate the ground wire (this is the brown/black wire on '86-'88 cars, and the black wire on '89-'92 cars) and separate it slightly from the harness. Cut it, then strip both ends a little. When you cut make sure to leave ample room on both ends. Slip some adhesive lined heat-shrink tubing over one end before twisting both ends back together with an additional third wire. Solder the connection, cover with dielectric grease and then use the heatshrink tubing to seal it. Now run this third wire along the harness to either a good body ground or (preferably) the ECU ground on top of the engine. This essentially regrounds all the engine sensors except the O2 and knock sensor.
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