Should I have a spring in a PCV?? - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-12-2006, 11:20 PM   #21
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I will get a pictures when i am back in town.

To recap,

1. The UIM was replaced. The the new UIM kit came with the PCV housing but not the valve.
2. When i did some more digging I found out that the PCV valve was missing in the old UIM. I was able to get a new PCV valve but the pictures (see previous thread link) also shows a spring (coil). Question is do i need that coil spring. The PCV valve has a build in spring.
3. The map sensor that sits on top of the PCV housing unit broke. The map sensor split into two pieces. The inside was full of dirt and oil. I was able to clean the inside and put the two pieces together and insert it back on top of the PCV housing.

Again, I will get pictures once I am back in town.
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Old 09-13-2006, 08:34 AM   #22
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PCV'* don't have built in springs, yes.. you need one.
Map sensor is broken and needs to be replaced as well.
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Old 09-14-2006, 01:05 AM   #23
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Quote:
Originally Posted by mysterio
I will get a pictures when i am back in town.

To recap,

1. The UIM was replaced. The the new UIM kit came with the PCV housing but not the valve.
2. When i did some more digging I found out that the PCV valve was missing in the old UIM. I was able to get a new PCV valve but the pictures (see previous thread link) also shows a spring (coil). Question is do i need that coil spring. The PCV valve has a build in spring.
3. The map sensor that sits on top of the PCV housing unit broke. The map sensor split into two pieces. The inside was full of dirt and oil. I was able to clean the inside and put the two pieces together and insert it back on top of the PCV housing.

Again, I will get pictures once I am back in town.
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Old 09-14-2006, 01:28 AM   #24
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FWIW, my 96 L36 doesn't have a spring, and the FSM doesn't show it either.
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Old 09-14-2006, 02:17 AM   #25
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Quote:
Originally Posted by Arbelac
FWIW, my 96 L36 doesn't have a spring, and the FSM doesn't show it either.
Yeah, like jr's3800 suggested, I'm guessing the spring is used on the L36 with the MAP sensor. I think the MAP sensors appeared in '97 (?). Anyway, my '95 has no spring, and it runs just fine. The plastic cap pushes the body of the valve down against the o-ring to ensure the seal.
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Old 09-14-2006, 04:20 PM   #26
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Quote:
Originally Posted by bill buttermore
Quote:
Originally Posted by Arbelac
FWIW, my 96 L36 doesn't have a spring, and the FSM doesn't show it either.
Yeah, like jr's3800 suggested, I'm guessing the spring is used on the L36 with the MAP sensor. I think the MAP sensors appeared in '97 (?). Anyway, my '95 has no spring, and it runs just fine. The plastic cap pushes the body of the valve down against the o-ring to ensure the seal.
96 Having OBD2 has the MAP sensor... Was the first year for its use.. 87-95 did not have a Map sensor

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Old 09-14-2006, 05:39 PM   #27
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can someone show me a picture of the parts in question? I purchased a PCV valve for my 98 SSEi and it did not come with a spring. Do they assume I will use the old spring?
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Old 09-14-2006, 07:29 PM   #28
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I guess they think the old spring will be used. Perhaps Buttermore is right, and a spring isn't always necessary to create a tight seal. However, I put a spring in mine, and I think it ought to be there. Makes sure the PCV is seated securely.

One thing you can check:

With the motor running, take off your oil filler cap and place your hand firmly over the filler neck to create a seal. If there is vacuum pressure sucking your hand from inside the crankcase, something in your PCV system isn't functioning correctly. When I put a spring under my PCV valve, it eliminated a slight bit of vacuum that was trapped inside the crankcase.
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Old 09-14-2006, 09:59 PM   #29
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We'll, got back and got a PCV kit that came with, the valve, "coil spring", two o-rings and the PCV plastic housing. I replaced the MAP sensor also.

The car idleswith no issues. But there is still remains a hesitation when i am accelerating. Around 2500-3000rpm. The pedal feels stiff and wondering if I should of clean the TB. There are three plastic connectors on the TB. Two on the side and one on the top. I pull them out to see if there were any issues with it and the one of the two along the side (closes) to the engine, has a spring and lever, that goes in and out. any idea what this is used for and does it need to be replaced since it was full of dirt and looks very worn out. BTW: There seems to be a engine knock at high RPMs.

The good news is that the engine light is off.. Sorry to be a pain but I am do appreciate all the help... I know of a friend who got a PC software and cable to get engine diagnostic readings. Any info on this would be great.
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Old 09-14-2006, 10:21 PM   #30
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When you say there'* a "spring and lever," are you referring to the throttle linkage? Does it have two cables connected to it? If so, that spring and lever opens and closes the plate inside your TB to let in the appropriate amount of air for how much you press on the foot feed. The sensor associated with these parts is the throttle position sensor.

I'm guessing the other two sensors you're referring to are the idle air control valve and mass air flow.
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