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Question about fuel pressure Posted By: mongoose5645 On: 05-03-2008 @ 20:24:39 Reply | Edit Lately I've been having some issues. seems like when I let it sit after driving and go to start it back up, say 10-15 minutes later, it sometimes wont start right away without either priming it a couple times, or giving it some gas while turning it over. My fuel pressure checks out both before and after starting, but leaving the pressure gauge on, I see a steady decrease over time. And a lot of times when it does fire, it revs to about 2k and stays there until the extra fuel that was sitting in the cylinder(s) burns off. It's been feeling a little sluggish lately too. Mainly when just taking off. I thought it might be my clutch going with that issue, but it checked out as good at a clutch shop. Just feels like something is not right with my fuel. I know it's running way too rich. In fact I failed emissions because of that. My cruise emissions were fine, but the idle emissions were way above limits. Any ideas? Thanks -- 1993 Z28, Eibach Pro kit, KYB adjustable shocks & struts, custom boxed rear control arms and panhard rod, strut brace. 18" C5 rims wrapped in Toyo T1-R's -- 1993 Z28, Eibach Pro kit, KYB adjustable shocks & struts, custom boxed rear control arms and panhard rod, strut brace. 18" C5 rims wrapped in Toyo T1-R's [ Edited on 05/03/2008 @ 20:26:13 ] Posted By: mongoose5645 On: 05-04-2008 @ 04:39:12 Reply | Top | Edit Both my HC and CO numbers were too high on my emissions test. Also not sure if it's related, but the car seems to heat up faster these days while sitting in traffic. Maybe from the added fuel at idle? -- 1993 Z28, Eibach Pro kit, KYB adjustable shocks & struts, custom boxed rear control arms and panhard rod, strut brace. 18" C5 rims wrapped in Toyo T1-R's Posted By: 94fireturd On: 05-04-2008 @ 09:26:04 Reply | Top | Edit Check fuel regualtors. Could have an injector leaking down into the cyl. Buy a fuel pressure gauge and tell au what it reads at idle, and after 10-15 min of sitting. -- 
94 Formula: sold 00 WS6: sold 1993 Z28: CIA, Hooker LT's, Mufflex Y,!EGR!AIR!CATS Posted By: Calaban007 
On:
05-04-2008 @ 10:44:49 Reply | Top | Edit
Do you have gas in your oil? -- 
1995 Camaro Z28, M6, T-Top Conversion & 1989 IROC-Z Stock restoration in progress, well almost stock 
http://www.myspace.com/163296073 Posted By: mongoose5645 On: 05-04-2008 @ 11:48:49 Reply | Top | Edit I'll get some new readings on the pressure. Oh and the regulator is maybe a month old. I was thinking maybe that was the problem and just threw one on. Same problem I just changed my oil last weekend and didn't really notice any gas odor. -- 1993 Z28, Eibach Pro kit, KYB adjustable shocks & struts, custom boxed rear control arms and panhard rod, strut brace. 18" C5 rims wrapped in Toyo T1-R's -- 1993 Z28, Eibach Pro kit, KYB adjustable shocks & struts, custom boxed rear control arms and panhard rod, strut brace. 18" C5 rims wrapped in Toyo T1-R's [ Edited on 05/04/2008 @ 11:49:40 ] Posted By: mongoose5645 On: 05-04-2008 @ 12:37:01 Reply | Top | Edit Pressure readings:: 42 @ priming 39 @ idle 34 as soon as I turned the car off 32 after about 12 minutes -- 1993 Z28, Eibach Pro kit, KYB adjustable shocks & struts, custom boxed rear control arms and panhard rod, strut brace. 18" C5 rims wrapped in Toyo T1-R's Posted By: mongoose5645 On: 05-06-2008 @ 20:22:06 Reply | Top | Edit any ideas? -- 1993 Z28, Eibach Pro kit, KYB adjustable shocks & struts, custom boxed rear control arms and panhard rod, strut brace. 18" C5 rims wrapped in Toyo T1-R's Posted By: batmanlt1 On: 05-07-2008 @ 07:10:15 Reply | Top | Edit you need a fuel pump, the readings are too low, you should see about 45-50 at idle. Posted By: mongoose5645 On: 05-07-2008 @ 18:43:05 Reply | Top | Edit so...it's running rich from not enough fuel? and when I looked at other posts the pressure is right where it should be -- 1993 Z28, Eibach Pro kit, KYB adjustable shocks & struts, custom boxed rear control arms and panhard rod, strut brace. 18" C5 rims wrapped in Toyo T1-R's Posted By: 94ylwcam On: 05-07-2008 @ 22:26:22 Reply | Top | Edit Have you ever had a tune up done on the car? Sounds like a ignition issue to me. -- 94 Camaro Z28 moroso CA,trick flow elbow, MSD coil, Harwood fiberglass hood and Yellow Devil paint moroso wires ,flow master Posted By: batmanlt1 On: 05-08-2008 @ 07:00:31 Reply | Top | Edit DUDE, IF THOSE ARE YOUR FUEL PRESSURE READINGS THERE LOW, YOU NEED A FUEL PUMP, AND BY THE WAY WHEN YOU HAVE "NOT ENOUGH FUEL" THE CAR IS RUNNING LEAN. Posted By: mongoose5645 On: 05-08-2008 @ 19:26:26 Reply | Top | Edit Have you read anything that's been said Batmanlt1? I know the difference between rich and lean, so my RICH condition that I have it makes no sense that my fuel pump is not working. Maybe the fuel pump is magically pumping more fuel because it's gone bad? What other parts should I just throw at it to see if it works? Also my repair manual and everyone else must be wrong about those pressure readings being dead on for where they should be huh? -- 1993 Z28, Eibach Pro kit, KYB adjustable shocks & struts, custom boxed rear control arms and panhard rod, strut brace. 18" C5 rims wrapped in Toyo T1-R's Posted By: 94ylwcam On: 05-08-2008 @ 22:03:56 Reply | Top | Edit My car has almost 10 more psi at idle then yours but I did have a rich condition. A low spark voltage can cause these symptoms. Try checking the egr valve. It could be stuck open. -- 94 Camaro Z28 moroso CA,trick flow elbow, MSD coil, Harwood fiberglass hood and Yellow Devil paint moroso wires ,flow master Posted By: mongoose5645 On: 05-08-2008 @ 22:07:19 Reply | Top | Edit got the car back from the shop today, everything checks out sensor wise. The guy said looks like it just needs a tuneup. Thinking maybe my plugs got fouled when my opti was going out a little while ago. -- 1993 Z28, Eibach Pro kit, KYB adjustable shocks & struts, custom boxed rear control arms and panhard rod, strut brace. 18" C5 rims wrapped in Toyo T1-R's
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