Built vette timing issue
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Instructor
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Built vette timing issue
Hey guys, it's been awhile I've really been wrenching hard lately. So I got my vette to run and drive with it's new top end revamp. It idles very nicely but under load at anything off idle it just dies out and if I hold the gas down to much for to long it's just dies. I did get a chip from ed wright and I'm wondering if the timing curve is off, any ideas? Thanks guys
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Le Mans Master
Joined: Sep 2013
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From: near the thumb in the mitten
You should be able to watch timing with timing light. Timing light with advance would be best. What happens with set timing connector disconnected? Vacuum routing? Restricted exhaust(cat. conv)? Balancer wobble?...ring moved.
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Instructor
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It's not exhaust, I need to check the timing while it runs, I've set it to 8 degrees but haven't checked total timing
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Instructor
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So I talked it over with my buddy who builds tpi and lt motors, we discussed that my bad fpr is causing a very rich condition and it shoots black smoke like a diesel so I ordered a new one from summit, hopefully that's just the problem. I'll let you guys know how it comes out👍
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Thread Starter
Instructor
Joined: Apr 2012
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Ok well I replaced the fpr with an adjustable one and set it to 40 psi and still same problem, it seems once it's in closed loop the plugs are set to .045 with 10.5-1 compression could that be wiping out the spark?
The injectors are almost new so I'm really stumped
The injectors are almost new so I'm really stumped
Instructor
Joined: May 2013
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From: Central Minnesota
Hey Bob, I'm unaware of what type of top end mods you have, but I too run 10.5:1 CR. I personally use an MSD HEI distributor with both vac and mechanical advance. I use accel "header" spark plugs to clear the long tubes I have and I'm not sure on the exact plug gap that I use (can't check, I'm at work right now), but I know its smaller than the stock gap setting. PM me with the details on your top end build or just post a link to a build thread if you have one and once I get home from work I can measure my spark plug gap and give you my 2 cents.
Safety Car
Joined: Sep 2001
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From: Glenbeulah Wi
You need to see if the car is going lean or rich, I do not believe the spark is being wiped out. It sounds like it is very rich from your black smoke comment. It appears to me that the chip has the wrong injector values entered in.
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Instructor
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I'm going to try and data log my buddy has a cable so I'm going to see if anything is out of the norm or if something's not working, thanks guys I'll keep you posted on my adventure into tpi land haha
Instructor
Joined: Sep 2011
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From: Fort Ripley Minnesota
Hey guys, it's been awhile I've really been wrenching hard lately. So I got my vette to run and drive with it's new top end revamp. It idles very nicely but under load at anything off idle it just dies out and if I hold the gas down to much for to long it's just dies. I did get a chip from ed wright and I'm wondering if the timing curve is off, any ideas? Thanks guys
Drifting
Joined: Jun 2013
Posts: 1,590
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From: ft myers FL/Munising MI
lots of threads on these performance chips....I don't believe they work all that well...I had one....went back to stock...car runs much better...lots more power on acceleration......
Race Director
Joined: Apr 2002
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From: Anaheim CA
The ECM controls the spark advance, so it's highly unlikely that it is somehow changing by itself or is "off".
The ECM could think the coolant is cold. In that case it will richen the mixture. A bad (corroded connector contacts) or open connection to the CTS can cause that.
The ECM could think the coolant is cold. In that case it will richen the mixture. A bad (corroded connector contacts) or open connection to the CTS can cause that.
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Instructor
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Ok guys tried everything and am going to order the obd to USB cable but I did check my cts and it was all over the place never one steady number so I'm going to replace it tomorrow, would anything else cause it to run rich without a code? I checked with ed wright and he said the tune should work fine
