Engine swaps: It's the little things

"Jake - Has Bad Luck So You Don't Have To" (murdersofa)
05/31/2015 at 21:32 • Filed to: None

See that? That’s a Honda D16Y7’s throttle body. Here’s an idea of how finicky it is: 16 hours of total work time were spent swapping a new engine into my Civic. So far I have spent another 16 hours just trying to get this little shit to cooperate. I’m five seconds from blocking off the IACV entirely, because when I did that to test if it was working all of my problems magically disappeared.

DISCUSSION (22)

TheHondaBro > Jake - Has Bad Luck So You Don't Have To
05/31/2015 at 21:43

*inb4 VTEC joke.

Nobi > Jake - Has Bad Luck So You Don't Have To
05/31/2015 at 21:44

Have you tried taking the IAC off and cleaning it out? Sometimes that's all it takes to fix issues on a Honda D-series.

Daily Drives a Dragon - One Last Lap > TheHondaBro
05/31/2015 at 21:55

No.

Jake - Has Bad Luck So You Don't Have To > Nobi
05/31/2015 at 22:29

Yup. I also tried swapping the IAC. It didn’t work.

Nobi > Jake - Has Bad Luck So You Don't Have To
05/31/2015 at 22:31

Is it a known good IAC? If you block it off and it works, it's either a bad IAC or the wiring.

Jake - Has Bad Luck So You Don't Have To > Nobi
05/31/2015 at 23:19

It was teh IAC from my other engine, which ran perfectly

michael bleggi > Jake - Has Bad Luck So You Don't Have To
06/01/2015 at 00:20

have you used anything to verify that there isn’t a vacuum leak elsewhere? or are you have symptoms of too much vacuum...

Nobi > Jake - Has Bad Luck So You Don't Have To
06/01/2015 at 06:46

I’d say either wiring issue or it decided at that moment to crap out.

brianbrannon > Jake - Has Bad Luck So You Don't Have To
06/01/2015 at 09:16

Straight engine swap or upgrade? Does the plug for the IAC fit another sensor?

Jake - Has Bad Luck So You Don't Have To > michael bleggi
06/01/2015 at 10:10

Sometimes the symptoms go away, so unless the leak comes and goes I dunno what’s up

Jake - Has Bad Luck So You Don't Have To > brianbrannon
06/01/2015 at 10:10

Straight swap. The plug is unique

brianbrannon > Jake - Has Bad Luck So You Don't Have To
06/01/2015 at 12:00

What are the symptoms?

Jake - Has Bad Luck So You Don't Have To > brianbrannon
06/01/2015 at 12:06

Super high idle *some of the time*, and occasionally my idle will pulse up and down about 75rpm. With either IACV. I think I have a leaky throttle body

brianbrannon > Jake - Has Bad Luck So You Don't Have To
06/01/2015 at 13:03

Sounds like classic air bubble in the cooling system. Did you run it with the radiator cap off untill all the air worked its way out? I use a special funnel for this to keep the coolant from spilling everywhere.

Jake - Has Bad Luck So You Don't Have To > brianbrannon
06/01/2015 at 13:25

Yeah, I’ve done a hardcore bleed of the coolant system. Jacked the front of the car up about four feet and let it idle for a couple of hours. I also tried vacuuming out the system. I’m befuddled.

brianbrannon > Jake - Has Bad Luck So You Don't Have To
06/01/2015 at 14:31

Can you read the data list with a scan tool while it's doing it?

Jake - Has Bad Luck So You Don't Have To > brianbrannon
06/01/2015 at 15:14

Yup, but honestly nothing looked weird.

brianbrannon > Jake - Has Bad Luck So You Don't Have To
06/02/2015 at 09:40

Pull the cover off the cold air valve (two screws) and screw the white plastic plunger clockwise until it bottoms out.

Jake - Has Bad Luck So You Don't Have To > brianbrannon
06/02/2015 at 13:11

That’s the white bit on the end of the green plastic electrical part?

brianbrannon > Jake - Has Bad Luck So You Don't Have To
06/02/2015 at 22:21

That throttle body looks a little strange. What year car and engine?

search fast idle control valve. Just for KISS sake did you adjust the idle screw?

Jake - Has Bad Luck So You Don't Have To > brianbrannon
06/03/2015 at 10:37

98 Civic D16Y7. I’m 98% sure I have a vacuum leak somewhere causing me to idle at 1500 which is so high the IACV has absolutely no effect on idle speed at that point. Problem is my machine for finding vacuum leaks is broken at the moment, so I just blocked off the IACV by sandwiching a piece of aluminium between the IACV and the TB. Car runs perfectly now.

brianbrannon > Jake - Has Bad Luck So You Don't Have To
06/03/2015 at 12:57

Spray with carb cleaner and the idle will change when it hits the leak