Alright i have a obd1 GSR w/ a skunk2 intake manifold and throttle body. it is not throwing any CEL's, VTEC engages properly and the car runs hard BUT it redlines at 6500 RPM instead of 8200 RPM. Please some help me . Thanks in advance


Modified by jeffnerette at 5:02 PM 11/13/2008

 

come on, someone help me please.

 

Did it just start doing it? or is this something you just put together

 

its been doing since i did the swap about 6 months ago but i didnt think much of it because i was running a stock p28 automatic but i replace the ecu with a stock p72 and its still doing it.

 

what year 72 is it out of?

 

no clue but i know it obd1. is there a way to find out on the ecu?

 

sometimes there is a year and i think auto has a lower rev

 

how do you know if its automatic

 

what year is your motor the P72 is from 94-95 OBD-1 Integra GSR

 

motor is 94

 

desperate bump for help

 

I still would try another ecu, is your gsr a auto? Shouldnt it throw a code if its not a auto or theres a separate control module for the auto.

 

I don't have another ecu to try. And my GSR is manual and the ecu I don't know. But it not throwing any CEL.

 

Take it somewhere that has ECUs laying around so they can try a known good one into your car.

Why were you using a P28 automatic on the GSR swap?

 

its probably all he had. Try to get the correct ECU and try it. Make sure your check engine light is working too, i know it sounds stupid, but bulbs do burn out.

although, i dont think it would throw a code if its the wrong computer

 

like sol2hatch said it the only ecu I had. And it was auto because I did the GSR swap/auto to manual conversion at the same time. My CEL works because it threw code 41 for o2 sensor and I changed it and in went out but still recline at 6500 RPM. I'm running out of ideas.

 

check what ecu do you have, i know the older ones dont rev as high as the obd1

 

obd1 p72

 

Is the ECU JDM or USDM? Grab your stock ECU and compare it side to side, if it's JDM, the JDM ECU will be a little bit smaller than a USDM ECU. Auto GSRs were only available in the Honda Integra SiR-G, so if you've got a USDM ECU, then it can't possibly be automatic.

Also, I don't think the Auto ECU has a lower redline, I had an Auto LS/VTEC DB7 with JDM P30 AUTO ECU and it would usually shift around 7800rpm at WOT, but I never had the Auto P72, so I can't say for sure.

Usually a low redline is an indication of a timing belt one tooth off or a bad distributor.

 

its the same size as the stock ecu thus making it usdm which means it manual. ok. now how would the distributor cause the low redline? i want to take care of things before i jump to the timing belt unless im 100% sure thats the problem.

 

Check your timing belt first, it's easiest. Pop your valve cover off, turn the engine to TDC and look to see if the marks line up. Swap distributors with someone else to see if that's the problem.

Edit: On the distributor part, it's usually the coil that causes the problem. Your stock SOHC coil should be interchangeable if you don't have another distributor to swap over for a quick test.