hesitation, bogging
07-01-02, 12:44 AM
#26
Senior Member
Thread Starter
Join Date: Jun 2002
Location: Richmond, Va.
Posts: 309
Likes: 0
Received 0 Likes
on
0 Posts
Wade,
at cold startup I read:
1280 rpm, L: Pr3, O2 R, T:-6degrees, 1r w/ an error code of 0200 after experiencing the 4.5k bogging
After resetting my battery I read:
1300 rpm L: Pr3, O2 R, T 1 degree, 1r,
II read:
1130 rpm, Pw: 3.8, O2 88R, F:7%
Once warm,
I read 13 lbs. boost at WOT, and 79% fuel. I just added a RB cat- back.
Any thoughts???
at cold startup I read:
1280 rpm, L: Pr3, O2 R, T:-6degrees, 1r w/ an error code of 0200 after experiencing the 4.5k bogging
After resetting my battery I read:
1300 rpm L: Pr3, O2 R, T 1 degree, 1r,
II read:
1130 rpm, Pw: 3.8, O2 88R, F:7%
Once warm,
I read 13 lbs. boost at WOT, and 79% fuel. I just added a RB cat- back.
Any thoughts???
The following users liked this post:
mazdadud (05-07-22)
07-01-02, 12:32 PM
#28
Senior Member
iTrader: (1)
Join Date: Feb 2001
Location: Charleston, WV
Posts: 610
Likes: 0
Received 0 Likes
on
0 Posts
matwey,
Clearing the ECU like that can temporarily fix problems. If your problems were fuel cut caused by the stock ECU detecting knock, clearing the ECU would cause the stock ECU to "forget" about the knock. If you are encountering extra noise or knock though, the problem will probably come back. Drive for awhile and see what happens.
Wade
Clearing the ECU like that can temporarily fix problems. If your problems were fuel cut caused by the stock ECU detecting knock, clearing the ECU would cause the stock ECU to "forget" about the knock. If you are encountering extra noise or knock though, the problem will probably come back. Drive for awhile and see what happens.
Wade
07-09-02, 11:10 AM
#29
Senior Member
It Worked !!
Originally posted by blackscorpio
Its your MAP (boost) sensor. When it pops of your idle gets low and eratic and you run really rich. At WOT you basically flood you engine, what you have to do is reconect the MAP Sensor (ties work the best the factory clamps suck). replace spark plugs (they should be pretty fouled by now) and oil(You will have gas in it thus the stinky oil) and reset the computer (negative off battery brake in for 30 seconds) and you should be all set.
If the MAP sennsor is hooked up (all hoses connected on it) and you may have a leak in the line or a bad MAP sensor. PM me If you have any questions.
Its your MAP (boost) sensor. When it pops of your idle gets low and eratic and you run really rich. At WOT you basically flood you engine, what you have to do is reconect the MAP Sensor (ties work the best the factory clamps suck). replace spark plugs (they should be pretty fouled by now) and oil(You will have gas in it thus the stinky oil) and reset the computer (negative off battery brake in for 30 seconds) and you should be all set.
If the MAP sennsor is hooked up (all hoses connected on it) and you may have a leak in the line or a bad MAP sensor. PM me If you have any questions.
teh ground near the UIP and added a 4g ground wire from PEP BOYs.
Thanks
Blackscorpio !! You Da Man
Problem is GONE
07-09-02, 11:31 AM
#30
2 babies - no back seats
Join Date: Nov 2001
Location: N. Wilm., Delaware?
Posts: 981
Likes: 0
Received 0 Likes
on
0 Posts
The problem usually comes back in a few days. At least it does for me.
Has anyone gone through the Shop Manual to the diagnostics section on Hesitation/Stumbles on Acceleration section F-226? There are 8 steps and 7 hints listed:
1. Fuel Injector leakage
2. Fuel Pressure regulator stuck
3. Spark plug high tension lead damaged
4. Bad plugs
5. Bad pressure sensor
6. EGR stuck
7. Double throttle valve stuck
It lists 14 voltages to check at the CPU for various sensors and valves.
Anyone want to have a go at it?
Has anyone gone through the Shop Manual to the diagnostics section on Hesitation/Stumbles on Acceleration section F-226? There are 8 steps and 7 hints listed:
1. Fuel Injector leakage
2. Fuel Pressure regulator stuck
3. Spark plug high tension lead damaged
4. Bad plugs
5. Bad pressure sensor
6. EGR stuck
7. Double throttle valve stuck
It lists 14 voltages to check at the CPU for various sensors and valves.
Anyone want to have a go at it?
07-11-02, 09:07 AM
#31
2 babies - no back seats
Join Date: Nov 2001
Location: N. Wilm., Delaware?
Posts: 981
Likes: 0
Received 0 Likes
on
0 Posts
Anyone permanently fixed this problem without going to a PFC? Someone must have gone through the diagnostics above and determined what is up with this problem...
07-11-02, 09:39 AM
#32
Senior Member
Thread Starter
Join Date: Jun 2002
Location: Richmond, Va.
Posts: 309
Likes: 0
Received 0 Likes
on
0 Posts
Unfortunately no, and I have not had time to even try to fix mine w/ a PFC. I will try to get something done over the weekend though. I know I have at least one ground, we'll see about the rest.
07-11-02, 11:31 AM
#33
2 babies - no back seats
Join Date: Nov 2001
Location: N. Wilm., Delaware?
Posts: 981
Likes: 0
Received 0 Likes
on
0 Posts
My bet (for my car) is that it is #1 or leaking injectors. I am getting significant gas smell in the oil. Also the oil level would appear to be rising if not for my front cover oil leak.
08-22-02, 07:09 PM
#34
Junior Member
Join Date: Aug 2002
Location: Lexington, KY
Posts: 6
Likes: 0
Received 0 Likes
on
0 Posts
My FD also hesitates around 3k. When the car warms up the hesitation is much less noticable but the problem is still there. I will try the map boost sensor and check my spark plugs again. Any other thoughts? My car is stock.
08-23-02, 09:36 AM
#35
2 babies - no back seats
Join Date: Nov 2001
Location: N. Wilm., Delaware?
Posts: 981
Likes: 0
Received 0 Likes
on
0 Posts
Havn't had time to diagnose yet. I still have the same problems. Now I've also picked up a bouncing idle with the air cond on while cold. I'm going to take everything out under the intake when I get a second car soon. There is a lot of discussion about it here http://www.scuderiaciriani.com/rx7/3k_hesitation.html but no consistent fixes. Pettit told me some cars are fixed by replacing the ignition harness. Since I have every ground known to man, I think it is my injectors. I still get gas leakage into the oil.
08-23-02, 11:33 AM
#36
Senior Member
Thread Starter
Join Date: Jun 2002
Location: Richmond, Va.
Posts: 309
Likes: 0
Received 0 Likes
on
0 Posts
I added a ground at the firewal from the expansion chamber. That and a new set of plugs seemed to help, but it is still there. I don't drive my car until it has hit at least 150 degrees. (Aftermarket guage)
08-23-02, 01:03 PM
#37
#1 F0RUM TROLL
Join Date: Mar 2002
Location: Naugatuck, CT
Posts: 1,132
Likes: 0
Received 0 Likes
on
0 Posts
Two words- MAP Sensor!!!!!!!!!!!!!! I told you that weeks ago, did you check it yet.
You have all the symtoms of a blown off or loose MAP sensor hose. For the love of God just check it, Its 1 min to check and 2 mins to fix.
You have all the symtoms of a blown off or loose MAP sensor hose. For the love of God just check it, Its 1 min to check and 2 mins to fix.
Last edited by blackscorpio; 08-23-02 at 01:08 PM.
08-23-02, 09:03 PM
#39
Senior Member
Thread Starter
Join Date: Jun 2002
Location: Richmond, Va.
Posts: 309
Likes: 0
Received 0 Likes
on
0 Posts
dubulop: No, don't need to unplug O2
Black Scorpio: my bad, been working over 7 weeks w/ no days off. Need $ bad. Haven't done a thing for a few weeks. But, I promise I will check this weekend. Thanks 4 da advice.
Black Scorpio: my bad, been working over 7 weeks w/ no days off. Need $ bad. Haven't done a thing for a few weeks. But, I promise I will check this weekend. Thanks 4 da advice.
08-23-02, 10:32 PM
#40
Rotary Freak
Join Date: Aug 2001
Location: maryland
Posts: 1,734
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by dubulup
do you have to unplug the O2 sensor???
do you have to unplug the O2 sensor???
I was having problems kind of like these. Under light throttle while cruising at a constant speed anywhere between 2200-3600 RPM I would intermittently get a hesitation/bucking. Not like the "normal" 3k hesitation but much worse. It would "buck/hesitate" until I let off or gave it more throttle. This was more pronounced the hotter it was outside.
I called and talked to Peter directly and he said that this was a "lean misfire" caused by the factory ECU and was set like that for emissions purposes. Also he said it could have something to do with the secondaries coming online. The PMS "amplifies" the factory settings/maps and therefore the "lean misfire" is more noticable on some cars. He said to try:
1. Disconnecting the battery
2. Replace factory ECU if one was available
3. Unplug o2 sensor and drive around without it hooked up
I tried 1 and 2 and it didn't fix it. Recently Dont_Be_A_Rikki came over and we did a full non sequential conversion and left the o2 sensor unplugged and after about 600 miles IT'S GONE!!!!
I don't know if the o2 sensor trick fixed it or the full non sequential and bypassing the FPR solenoid?
Hope this helps.
Thread
Thread Starter
Forum
Replies
Last Post
Jeff20B
1st Generation Specific (1979-1985)
73
09-16-18 07:16 PM
