Rev limiter
12-17-2003, 07:26 PM
#31
Administrator
Join Date: Dec 2002
Posts: 13,991
Re:Rev limiter
Originally Posted by TurboEF9
CYP sensor will not cause improper rev limit, will however, cause misifing/detonation.
Cam timing is not going to lower your rev limit, you can be 2 teeth off and it will still rev, just rev (slow) or (fast) depending on which way it slipped. If the belt slipped any more than that it would bend valves.
The way he has described his problem it sounds like a Fuel/Spark cut is happening at 5000 rpms.
Just a suggestion, try a known good distributor, toss it in and see if it works. If not... try something else.
12-17-2003, 07:41 PM
#32
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Join Date: Mar 2003
Posts: 21,479
Re:Rev limiter
I have ran my car with the cam timing off at least two teeth and it still idled and reved to the normal rev limit. It ran like ----, but it still ran the normal rev range.
Nobody has asked this yet, but are you boosting this motor? Have you check the o2 sesor, fuel filters, all that ----?
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Nobody has asked this yet, but are you boosting this motor? Have you check the o2 sesor, fuel filters, all that ----?
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12-17-2003, 09:17 PM
#33
3.0 BAR
Join Date: Jun 2003
Posts: 1,558
Re:Rev limiter
Originally Posted by TurboEF9
Cam Timing.
I'm positive that is your problem, check it. Tell me I'm wrong.
You're probably a tooth, or a tooth and a half off.
I'm positive that is your problem, check it. Tell me I'm wrong.
You're probably a tooth, or a tooth and a half off. 
you know we love man, I'm actually thinking that may be the problem, see it happen before. And you don't need a timing light to check if the belt slipped, just put the crank pulley at TDC and check the cam gear... not too hard...
12-18-2003, 12:05 AM
#35
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Join Date: Oct 2003
Posts: 520
Re:Rev limiter
When I put a F22B1 VTEC head on my F22A1 I accidentally had the cam off by 2 teeth. I forget if it was advanced/retarded now. It revved to redline and idled fine but i experienced the following:
1.) I had to put my distributor at full advance/retard (I forget now.. this was a year ago) to get the timing light to show 15BTDC on the fly wheel marks.
2.) It had no *****... I musta killed 40hp having the cam timing off.
every car/situation is different though!
1.) I had to put my distributor at full advance/retard (I forget now.. this was a year ago) to get the timing light to show 15BTDC on the fly wheel marks.
2.) It had no *****... I musta killed 40hp having the cam timing off.
every car/situation is different though!
12-18-2003, 08:01 AM
#36
1.5 BAR
Join Date: Feb 2003
Posts: 828
Re:Rev limiter
Check the coil output. I had a Mazda MX6 once with a weak coil that wouldn't rev past 4000 RPM. The spark was very weak, it would only jump about 1/8" and was yellow, not bright blue. I have seen lots of bad coils on Hondas over the years. But they usually wont run at all. Just a thought.
12-18-2003, 08:31 AM
#37
1.5 BAR
Join Date: Jun 2003
Posts: 1,408
Re:Rev limiter
i bet it's your coil or ignition module in the distributor.
I did the mpfi swap and my ignition module was fucked up, I couldn't rev passed 4000 and everyone said it was in limp mode, it wasn't the ignition system was taking a dump and couldn't handle the higher revs. Goto autozone and swap them out in the parking lot, if it doesn't work just return them.
I did the mpfi swap and my ignition module was fucked up, I couldn't rev passed 4000 and everyone said it was in limp mode, it wasn't the ignition system was taking a dump and couldn't handle the higher revs. Goto autozone and swap them out in the parking lot, if it doesn't work just return them.
12-18-2003, 12:47 PM
#38
3.0 BAR
Join Date: Apr 2003
Posts: 2,260
Re:Rev limiter
Originally Posted by AbaZ
if the contact points inside of the distributor (pick ups) are out of range you can easily get codes 4/8 Crank/TDC sensor. This can cause a low rev limit, I've replaced dozens of faulty Distributors throught the years on hondas.
What?! Those codes have never stopped my car from reving. To verify my answer, I went and unplugged my TDC/CYP wires and rev'd. It rev'd clear to 7413, perfect.
..also, I thought he said he wasn't getting any codes? (Maybe I misread)
Cam timing is not going to lower your rev limit, you can be 2 teeth off and it will still rev, just rev (slow) or (fast) depending on which way it slipped. If the belt slipped any more than that it would bend valves.
Of course imporper cam timing can lower your rev limit. Due to the spinning of the motor, and lack of air flow when the valves are opening and closing faster at upper RPMs, your motor will not rev any further. I had this EXACT same problem about 4 months ago on a mini I did. Exact same problem. 6500 RPM rev limit. When I lined up the head, I used the mark at 7 o'clock instead of the ones at 9 and 3. Thus making my timing off about a tooth and a half. When I fixed this, it rev'd perfectly. He's describing this exact same problem.
What?! Those codes have never stopped my car from reving. To verify my answer, I went and unplugged my TDC/CYP wires and rev'd. It rev'd clear to 7413, perfect.
..also, I thought he said he wasn't getting any codes? (Maybe I misread)Cam timing is not going to lower your rev limit, you can be 2 teeth off and it will still rev, just rev (slow) or (fast) depending on which way it slipped. If the belt slipped any more than that it would bend valves.
Of course imporper cam timing can lower your rev limit. Due to the spinning of the motor, and lack of air flow when the valves are opening and closing faster at upper RPMs, your motor will not rev any further. I had this EXACT same problem about 4 months ago on a mini I did. Exact same problem. 6500 RPM rev limit. When I lined up the head, I used the mark at 7 o'clock instead of the ones at 9 and 3. Thus making my timing off about a tooth and a half. When I fixed this, it rev'd perfectly. He's describing this exact same problem.
12-18-2003, 01:16 PM
#39
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Thread Starter
Join Date: May 2003
Posts: 339
Re:Rev limiter
What about the variable rev limits achived when switching from PR4 to PM6, PR4=5000 PM6=6000. Is this acceptable with what you are suggesting? I'm at work right now so I wont be able to check my timing belt for some time.
-not boosted for future refrence-
-not boosted for future refrence-
12-18-2003, 03:15 PM
#40
Administrator
Join Date: Dec 2002
Posts: 13,991
Re:Rev limiter
Originally Posted by TurboEF9
What?! Those codes have never stopped my car from reving. To verify my answer, I went and unplugged my TDC/CYP wires and rev'd. It rev'd clear to 7413, perfect.
..also, I thought he said he wasn't getting any codes? (Maybe I misread)Of course imporper cam timing can lower your rev limit. Due to the spinning of the motor, and lack of air flow when the valves are opening and closing faster at upper RPMs, your motor will not rev any further. I had this EXACT same problem about 4 months ago on a mini I did. Exact same problem. 6500 RPM rev limit. When I lined up the head, I used the mark at 7 o'clock instead of the ones at 9 and 3. Thus making my timing off about a tooth and a half. When I fixed this, it rev'd perfectly. He's describing this exact same problem.
Faulty Coils and ignitors can do the exact same thing as mentioned above without throwing a code. Thats why I said try swapping in a different Distributor, and if that doesnt fix it, try swapping in a different ECU.
Its pretty distinct if the car is off 1 tooth Adv/retard. But it never hurts to check timing.
Jeff
