part identification

[mcma2244]

Hey I am new to this forum and was looking for a little help. I have a 1990 ZR1 and the rubber part I circled in green keeps popping off. I was wondering if anyone knew what could be causing this or if there is a replacement part. It seems to be idling quite high when I first start it, or it begins to stall. I had it attached to a diagnostic computer and it said one side was running rich and the other was lean. The Chevy dealer in town was stumped. Thanks

[IMG]file:///Users/Home/Desktop/Picture%20clipping%201.jpg[/IMG]

[Kevin]

looks like the map sensor hose. common problem, it can be cured by ziptying it to the MAP sensor and then holding the key just a bit longer then normal when starting the car

[mike100]

well, it looks like to me the rubber PCV elbow is circled. Those things can fit the pcv valves kind of loosely and leak all kind of extra air to the throttle body (high idle).

the high idle could also be a hose popped off under the plenum (somewhat common). Will it idle below 1200 rpms when it is warmed up?

btw, the LT5 start-up does rev a little high even when all is well. should idle down to 800 rpms within a short period of time.

[Pete]

Looks to be the feul regulator vacuum hose.
If it keeps popping out,look to see if regulator is leaking,start car and pull the hose off see if feul is coming out,if so you need to replace regulator.

Pete

[mcma2244]

Hey thanks everyone for the info, Ill try your recommendations and get back to you tomorrow when I pick it up from the dealer.

@Mike: It will sometimes idle below 1200 but will randomly shoot up past 1500rpm then will idle down to a stall.

[Kevin]

also, never take these cars to a dealer...you'll end up paying a lot for nothing

[tccrab]

Originally Posted by mike100

well, it looks like to me the rubber PCV elbow is circled. Those things can fit the pcv valves kind of loosely and leak all kind of extra air to the throttle body (high idle).

the high idle could also be a hose popped off under the plenum (somewhat common). Will it idle below 1200 rpms when it is warmed up?

btw, the LT5 start-up does rev a little high even when all is well. should idle down to 800 rpms within a short period of time.

I agree.
The part circled appears to be the PCV connector.
Kurt White sells 'em:
Just the upper connector thingy:
http://www.whiteracingproducts.com/i...2026bebacdc8e2
Both lower hose and upper connector:
http://www.whiteracingproducts.com/i...2026bebacdc8e2

TomC
'Crabs

[Pete]

The PCV hoses are a common issue on our Z's.
I just figured just looking at it one would know it's PCV's,i guess never assume anything.
This is why i suggested the feul line since that is also in the circle and a bad regulator will also have bad idle and stall motor.

Pete

[A26B]

It could be a leaking injector, considering the rich condition on one bank.

One of the tuning gurus could answer far better than me, but would a leaking injector cause the ECM to consider TPS at idle & command the IAC to increase idle air to compensate for the rich O2 signal on one bank?

I don't see it causing the PVC Connector to blow off, which may or may not be related at all.

We do see a lot of bad, original injectors leaking in the 90-92 models.

[PhillipsLT5]

Jerry, he is in OK, close to you?
PCV hose probably shot like all the rest