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Forum: C4 ZR-1 Technical Postings 12-18-2024
Replies: 28
Views: 8,498
Posted By ssmith95
Re: High/Hanging Idle

Unfortunately I dont know what they did to repair it. I sent it to Marc Haibeck, who then sent it off to be refurbished, so I never was in contact with the people doing the repair. Id be interested...
Forum: C4 ZR-1 Technical Postings 12-18-2024
Replies: 28
Views: 8,498
Posted By ssmith95
Re: High/Hanging Idle

I got my ECM back from Marc today and the repair was successful. The car idles and behaves as it should, finally. Thanks again to everyone who helped and responded. Im excited to finally get to enjoy...
Forum: For Sale & Wanted (General) 12-03-2024
Replies: 2
Views: 11,595
Posted By ssmith95
Re: Megasquirt and stock ecm for sale

Any chance the Megasquirt is still available?
Forum: C4 ZR-1 Technical Postings 11-25-2024
Replies: 28
Views: 8,498
Posted By ssmith95
Re: High/Hanging Idle

I talked to Marc this past Friday and he confirmed it is the ECM. He is sending it off for repair.

Just to recap in case anyone runs across this thread down the road. This was a real pain to...
Forum: C4 ZR-1 Technical Postings 11-12-2024
Replies: 28
Views: 8,498
Posted By ssmith95
Re: High/Hanging Idle

Yes and no. Marc had me check to make sure the IAC pintle was fully extending and it is not. I tested two IACs with the same result.



At this point it is looking like an ECM issue. I need the...
Forum: C4 ZR-1 Technical Postings 11-08-2024
Replies: 28
Views: 8,498
Posted By ssmith95
Re: High/Hanging Idle

Smoke test was revealing. The MAP line had a tiny leak around the nipple on the plenum, smaller line fixed that. I also can see smoke coming from two locations deep under the plenum. One coming from...
Forum: C4 ZR-1 Technical Postings 11-06-2024
Replies: 28
Views: 8,498
Posted By ssmith95
Re: High/Hanging Idle

Im headed towards buying a smoke machine. This car has got me totally stumped. I tested two separate IAC valves tonight and both are fully seated in the passage. I used a curved pick to see if the...
Forum: C4 ZR-1 Technical Postings 11-05-2024
Replies: 28
Views: 8,498
Posted By ssmith95
Re: High/Hanging Idle

I made some headway this evening. The vacuum line on the air horn was not connected, must?ve come off when I was reinstalling the plenum. That helped to bring the idle down considerably. With that...
Forum: C4 ZR-1 Technical Postings 11-05-2024
Replies: 28
Views: 8,498
Posted By ssmith95
Re: High/Hanging Idle

Marc did not mention the spring but I'll mention it next time we talk.



I drove the car a lot yesterday and had something happen that is going to make me look at the TPS and throttle blades...
Forum: C4 ZR-1 Technical Postings 11-04-2024
Replies: 28
Views: 8,498
Posted By ssmith95
Re: High/Hanging Idle

Marc responded to my email this morning and reaffirmed that I have a large vacuum leak somewhere. In addition to his common leak locations, he suggested I check the PCV valves since incorrect valves...
Forum: C4 ZR-1 Technical Postings 11-03-2024
Replies: 28
Views: 8,498
Posted By ssmith95
Re: High/Hanging Idle

I have not, but that is a good idea. Ill send Marc an email and see if he has any insight.
Forum: C4 ZR-1 Technical Postings 11-02-2024
Replies: 28
Views: 8,498
Posted By ssmith95
Re: High/Hanging Idle

I went back out to the shop and checked the throttle plates earlier and they are closed. I also pressed on them with the car running to see if they were binding and they are not.

A thick folder...
Forum: C4 ZR-1 Technical Postings 11-02-2024
Replies: 28
Views: 8,498
Posted By ssmith95
Re: High/Hanging Idle

Well my frustration is mounting. The new IAC did not make a noticeable change in the idle. I did pull the TPS and set it to .53 volts. That helped to bring the idle down to 750 with the A/C on and...
Forum: C4 ZR-1 Technical Postings 11-01-2024
Replies: 28
Views: 8,498
Posted By ssmith95
Re: High/Hanging Idle

Well bad news tonight. Got the car buttoned up and the idle is unchanged. The odd thing, twice when I started the car, the idle was normal. Blip the throttle and it wants to hang. I?m going to put a...
Forum: C4 ZR-1 Technical Postings 10-31-2024
Replies: 28
Views: 8,498
Posted By ssmith95
Re: High/Hanging Idle

Appreciate the help. My issue progressed to the point the idle would never come back down. It would sit at a light and idle at 1400 rpm the entire time.



I pulled the plenum last night and...
Forum: C4 ZR-1 Technical Postings 10-29-2024
Replies: 28
Views: 8,498
Posted By ssmith95
Re: High/Hanging Idle

Update: Went and bought a Mityvac and cannot pull a vacuum on the cruise/hvac vacuum circuit. Gaskets on the way from Jerrys and a plenum pull within the first week of ownership! Ill keep updating...
Forum: C4 ZR-1 Technical Postings 10-29-2024
Replies: 28
Views: 8,498
Posted By ssmith95
High/Hanging Idle

Hi Folks. Just picked up a 1990 ZR1 this past weekend and on the test drive the car was hunting for idle, but RPM would settle to an appropriate level. After stopping, idle would fluctuate for a bit,...
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