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Old 10-07-2015, 12:39 PM   #1 (permalink)
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Default Running with bad crank sensor harmful?

So i have a bad crank sensor apparently (code 4), but the car isnt in limp mode and seems to run fine. But probably would run better with a good sensor.

My question is, i have to wait for my next payday to get a new dizzy, so will driving the car like it is harm anything?? i think its making me run a little rich, i already burn oil so nothing new there.

Any input is greatly appreciated
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Old 10-07-2015, 12:51 PM   #2 (permalink)
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If I was in your shoes I would keep driving, and drive nice and easy. Probably down on power slightly and maybe on fuel economy, but chances are it will run just fine to get to and from work and the grocery store. If it gets worse it will likely run so poorly you won;t be able to drive it anyway.
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Old 10-07-2015, 01:00 PM   #3 (permalink)
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There is enough sensors to keep it running.
But it will be in a limp mode.
More or less dumpping extra fuel and pulling timing.

If you gotta drive it then do but take ot easy on the car and try not to do any high load driving
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Old 10-08-2015, 04:54 AM   #4 (permalink)
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Quote:
Originally Posted by v4lu3s View Post
If I was in your shoes I would keep driving, and drive nice and easy. Probably down on power slightly and maybe on fuel economy, but chances are it will run just fine to get to and from work and the grocery store. If it gets worse it will likely run so poorly you won;t be able to drive it anyway.
This is pretty much what i've been doing, which i figured was a safe enough bet

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There is enough sensors to keep it running.
But it will be in a limp mode.
More or less dumpping extra fuel and pulling timing.

If you gotta drive it then do but take ot easy on the car and try not to do any high load driving
well it isnt in limp mode?.. are you saying driving more may cause it to go into limp mode?
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Old 10-08-2015, 08:21 AM   #5 (permalink)
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It is not in the low rev limit take me to the dealer limp home mode. it is probably running in open loop where it does not adjust timing and fuel enrichment and only runs on the safe maps.
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Old 10-08-2015, 08:47 AM   #6 (permalink)
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That sensor is EXTREMELY sensitive, so it's not always a 100%/0% kind of failure. Chances are the ecu sensed enough signal loss that it popped the code, but didn't fall into limp mode. The first time I made an EF harness I was getting an intermittent code 4, and only half the time it'd enter limp mode.

It will be okay to drive if it's not in limp mode, but it's not going to get better. Clear the code & see if it comes back. If it does, you'll have to diagnose if it's the wiring or the sensor in the distributor (not serviceable). Normally I'd suggest using the factory service manual to diagnose both, but the EF version floating around the web didn't impress me. The EG version should be close enough.

In any case, proper diagnosing is via the manual is a LOT cheaper than just tossing on new parts & praying.
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Old 10-09-2015, 08:56 AM   #7 (permalink)
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Quote:
Originally Posted by HiProfile View Post
That sensor is EXTREMELY sensitive, so it's not always a 100%/0% kind of failure. Chances are the ecu sensed enough signal loss that it popped the code, but didn't fall into limp mode. The first time I made an EF harness I was getting an intermittent code 4, and only half the time it'd enter limp mode.

It will be okay to drive if it's not in limp mode, but it's not going to get better. Clear the code & see if it comes back. If it does, you'll have to diagnose if it's the wiring or the sensor in the distributor (not serviceable). Normally I'd suggest using the factory service manual to diagnose both, but the EF version floating around the web didn't impress me. The EG version should be close enough.

In any case, proper diagnosing is via the manual is a LOT cheaper than just tossing on new parts & praying.
yea i found the FSM diagnostic procedure and the sensor should be 350-700 ohms and mine is like 165 ohms so i'm pretty sure the sensor is done..

and this dizzy is barely even a year old smh, that what i get for goin budget and buying a $80 ebay dizzy
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Old 10-09-2015, 10:42 AM   #8 (permalink)
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so i'm doing some research and i have a question.... there are 3 "sensors" in the dizzy (CYP/TDC/CKP) but, are they all housed in that one bent lego looking piece?



i'm asking bc i have an old dizzy that had a bad TDC sensor and this current one has a bad CKP sensor, so i was going to try and put the good CKP sensor from the old dizzy into the current one... but it is looking like it may not be that simple
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