1990 Acura Integra Code 4

ADAM112286

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1990 ACURA INTEGRA

Electrical problem
1990 Acura Integra 4 cyl Front Wheel Drive Manual 186k miles

I rebuit my 1990 Acura Integra. I put bigger cams, bored.30 over. Adjustabel cam gears, cold air intake etc. Everything is brand new in the motor. My problem is I'm throwing a code 4. Crankshaft Position Sensor. I have replaced the dist. With a new one and still throws a code 4. My buddy has the same b18a motor and took his dist. Off and put it on my motor and still throws a code 4. I ran two jump wires from the sensor itself to the ecu and still throws a code. I have checked and also a mechanic has checked the wires from the dist. To the ecu and they all check out fine. Whats my problem?

5 Replies

KHLOW2008

MECHANIC
41,814 POSTS

Hi Adam112286,

Check the ECM.

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Tuesday, September 9th, 2008 AT 9:30 AM

ADAM112286

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I have already bought a new ECM and put it in and it still throws code 4. I have took the ECM out of my buddys running car and put it in and it also throws code 4.

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Tuesday, September 9th, 2008 AT 11:39 AM

KHLOW2008

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Hi Adam112286,

You have done all possible with the diagnostics so the only thing left for me to to suggest is to check the valve timing. You mentioned adjustable cam gears, maybe you have adjusted it too advanced or retarded.

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Wednesday, September 10th, 2008 AT 1:11 PM

ADAM112286

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When I had one of my mechanics look at my car they timed in the motor alone. I took the time in timin the valves to what my cams called for. I put stage 2 crower cams which come as Advertised Duration 264 / 264 Duration @.050" 221 / 220 Gross Lift w/1.75 422 / 411, I know there a bit big but I was hoping that they would work. Do you think this could be my problem? The cam gears are at stock settings. Should I try to adjust them again as I already have tryed in the past or should I just put my stock cams back in and see if it runs without the code?

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Thursday, September 11th, 2008 AT 12:04 PM

KHLOW2008

MECHANIC
41,814 POSTS

Hi Adam112286,

Actually I find it rather strange that the CKP code is showing as the distributor has no way of knowing the actual crankshaft position.

Does the error code appear immediately after starting or after a short period of the engine running?

Excessive valve lift requires diferent valve timing so if insist on the new set up, yu might need somw tinkering with the cam timing.

Th best way to confirn if the problem is caused by the camshafts is to reinstall the standard pcs.