(91 civic)my friend just swaped an si manifold onto his car. and the car wont start.the mani is missing the fast idle valve,could this be the cause of it? and he had take the old tps censor from the other many(could that cause it not to start). also are the hf and the si injector resistor any different ? does he need an si resitor box to push the si injectors.any help is appreciated thanx

 

If his car is an hf it was probably dpfi, there are plenty of threads on how to convert from dpfi to mpfi, you should try doing a search.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sohcd16 &raquo;</TD></TR><TR><TD CLASS="quote">If his car is an hf it was probably dpfi, there are plenty of threads on how to convert from dpfi to mpfi, you should try doing a search. </TD></TR></TABLE>

The hf and si are both mpfi, Its the dx thats dpfi..

 

Oh thought he was talking about the std. civic

 

ok the civic was dpfi but i put in a mpfi motor in it.then i got the si ecu and now i have the si im but now it wont start(it ran before as mpfi)

 

So you did the mpfi conversion on it and it ran fine with mpfi before you put this new motor in right?? Just want to make sure I understand you correctly..

 

ya this is all really confusing to me too. lets do a step-by-step.

1. Stock Civic STD
2. ... ? what motor/fuel system
3. ... ? what motor/fuel system

 

ok i did the swap about two months ago.from dpfi to mpfi and it ran fine.then i put the si ecu and it ran fine.now i put the si manifold but it wont start. the swap i put into is a d15b8 with si ecu

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by crxSoldado &raquo;</TD></TR><TR><TD CLASS="quote">ok i did the swap about two months ago.from dpfi to mpfi and it ran fine.then i put the si ecu and it ran fine.now i put the si manifold but it wont start. the swap i put into is a d15b8 with si ecu </TD></TR></TABLE>

When you went from dpfi to mpfi what ecu and manifold did you use and were you using the d15b8 at that time..

Im trying to narrow this down.. If nothing in your setup changed except you went from a ????? manifold to the si manifold then narrows it down alot..

 

yeah the only diff is the mani. i had to use the other tps and put it on this one .i know they have to be set up but would the tps cause it not to start?

 

It shouldnt.. And it would throw a code if it wasnt working properly..

 

it was the injectors