tricura

I have performed hundreds of swaps before and helped many people out. Now I'm reaching out. I swapped h22 into a 99 Si converted the wiring over my self. When the car hits 5200 rpm and VTEC tries to kick on the car stutter steps like it has a stutter box, can't ffigure it out. I have changed every sensor and computers and even rewired the car. Still does the same thing. Can put in an h23 ECU and the car will rev to 7300 rpm with no problem it is only when the VTEC tries to engage. Any help or thoughts would be appreciated. The car is a 99 Si with a H22 Jspec motor. I have used Us spec ECU's and Jspec.

aeolus

make sure you have really good grounds.ive dont this swap before and i cannot stress enough how important ground connections are.

tricura

Believe me done all wiring checks and can't find anything wrong.

aeolus

what exactly did you do with the wiring???i would need details on what you did to be able to at least imagine what might be goin on....

tricura

I rewired it from obdII to obdI. Took the stock SI wire harness and fitted it to the H22, then cut the ends off at the ecu and rewired the h22 ecu plugs to the SI wire harness. I have checked all my wiring three or four times using a Helm's manuals and can't find the problem. When VTEC tries to kick in at 5200 rpm the car acts like it has a stutter box and won't rev past 5200 rpm. I am getting desperate and will pay for peoples time if they can help me out. If i put in a P14 ECU the car will rev all the way up, only when a P13 is in and tries to kick in VTEC.

aeolus

did you crimp or solder all the connections???soldering is the best,but you still can get a bad connection.try resoldering the grounds,signal grounds and the vtec sol and vtec pressure wires.sometimes connections may look ok,but they might not be fully connecting.

aeolus

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1993sir &raquo;</TD></TR><TR><TD CLASS="quote">why didnt you just buy an obd2b to obd1 ecu jumper harness. plug it and go. let me guess you didnt want to spend the $175 on it. and look at you now you stupid ****, not a clue, i say you get a new engine harness, rewire it to fit the h22 on the engine side and the ecu side you plug in a jumper harness and call it a day.</TD></TR></TABLE>
Either way,it should still work.And also... attitude like that will get your *** banned fool!This guy has asked us for help,not to be ridiculed on his spending habits.

2trix

hmmm...no codes? you would have to be getting a code if vtecs not kicking in or falling out...theres a chance you may not be...id chk the tps if its out of line at all and not in the right groove it will be like hitting your rev limit...also chk to see that all sensors are getting the right amnt of voltage...

tricura

I solder everything so there is no problems in the future. All grounds are hooked up and all wires that are supposed to shielded are. The wiring is very clean and easy to trace.

tricura

First of all been doing swaps for 15 years, I think i can handle reiwing a car to properly work. Didn't spend the money because I've done the before. Why pay when you have the know how. The only reason I'm reaching out is because I have helped people like you when you didn't have the know how. So now I'm asking for some input back.

tricura

The sensors are getting the right amount of voltages, I have even changed every sensor on the car with new ones. I can pull the connectors off of the VTEC solenoid and get a code from it and the motor will rev to 8k. but as soon as I hook it up it stutters and won't rev past 5200.

aeolus

dam,wish you were closer by,but last time i had a similar problem was because i had a bad connection,it looked like a pretty dam good solder connection,and for some reason my volt meter said it was good,but i just unsoldered it and re did it,then the problem went away....strange i know,but i still have no definite answer what happend in that situation .if i can think of anything,ill let you know.

AudioFuct

When you have been using your p13 and getting that weird stutter at vtec, have you been using the same p13 every time? Have you tried using a different p13? From reading what i have been reading, it seems that obviously your problem is vtec (just doing process of elimination). Becaues you said that when you use h23 ecu you have no stutter (no vtec, obviously). And you also said you made very sure your wiring is absolutely correct right (solenoid to a4 and pressure to d6)? If all your wiring, and ALL your connections, and all your sensors are good, i would think the problem would lie in the ecu you keep using. That is of course if you use the same p13 every time.

I was trying to relate this to a similar problem i was having with a stutter (and ELD code) and for me it turned out that i had my ECT A wired wrong (the ECT switch on the thermostat housing). But my stutter was at like 3k not at vtec.

tricura

I appreciate your help though. Maybe that is what I will look into. Thanks for you input. If i come up with an answer I will let you know. Thanks again.

tricura

No I do have three P13 ECU's one that is a JDM, one that is US spec, and a chipped Spoon I think, but they all do the very same thing. It has been mind boggling and way to many hours in it. I'm going back to changing all the sensors and rewire the car again with another harness. I guess I will see what happens.

AudioFuct

Its too bad we cant see your wiring. That would help us help you t-shoot alot better.

DerangedEG

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tricura &raquo;</TD></TR><TR><TD CLASS="quote">No I do have three P13 ECU's one that is a JDM, one that is US spec, and a chipped Spoon I think, but they all do the very same thing. It has been mind boggling and way to many hours in it. I'm going back to changing all the sensors and rewire the car again with another harness. I guess I will see what happens.</TD></TR></TABLE>

Bad VTEC solenoid.?

tricura

Hey, Had the wrong injectors for the ECU. swapped them out with a third set and it works great. Thanks for your help. If you need anything ask me and I will be there!