After approximately 10 minutes, the telltale will turn OFF. So it really shouldn't have anything to do with the injectors, just pressure. But injectors pulse works off of ground from ecm.you have to have the grounds at thermostat and intake or will not pulse injectors.Grounds for all sensors. It needs a break in. A forum community dedicated to all General Motors truck owners and enthusiasts. JavaScript is disabled. I guess no one reads.injector pulse comes from ecm..via ignition module..pickup coil.Once ecm senses 400 rpm,s from engine it takes over. im sure he has a scanner. That was when we realized how cheap a complete replacement distributor was. Sadlyall grounds are excellent. Battery grounded directly to motor. Vortec 350 no injector pulse. But I put in a motor n tranny, got it running and it runs super smooth. It is so rusted and corroded its unreal. pickup coil ..bad or clogged injectors, "Whenever you have eliminated the impossible, whatever remains, however improbable, must be the truth ". Premium Member. It is good. live data will show stuff when cranking . Unplugged tps and nothing. No pulse at all. Mar 12, 2012. Putting in the new fuel pump tomorrow tomorrow as long as it comes in in time. There's no need to change the pump if you have 14lbs (unless you just want to change for peace of mind while tank's out). I put new plugs but never pulled cap n rotor when I installed engine. With a master vehicle key, start the vehicle. Fuel pressure is good, when I ground each injector I get a good cone of fuel spray. But, I have the one that came out of the Yukon with 68k miles on it. Okay ecm fires injectors with groundshould have a set of ground wires at thermostat..and one on intake behind where ac pump is or should be. . so this is were LIVE data showing on a scanner you can see whats missing a lot of the time. Want instant access with unlimited photo and video storage and tons of other benefits? Injectors are not getting any commands from the computer. Injectors are not pulsing. Repairing, restoring or modifying your ride just got a whole lot easier! Seems to be the most prevalent answers on most sites. such as crank position / cam position / tps / fuel pressure on some / all sorts of stuff . It has a whipple supercharger on it, so would rev pretty quick. Tried to start it next day and didn't start. but I have seen a bad distributor module have spark but no injector fire on tbi. If it ran before ..you must be missing something..wire a connection..has to be either a bad ground..ign. 3. As it is a brand new engine? Im not too keen on TBI injection systems personally but do you know where exactly your injector pulse is supposed to come from? Since then it has grown to be a leader among full size Chevrolet K5 Blazer and GMC Jimmy web sites across the Internet. JavaScript is disabled. but this wont help you a lot of the time . What causes no injector pulse? i have a major ground wire from intake to the firewall by the ac/heater box. Im not sure if its the same on the vortec, but I have seen a bad distributor module have spark but no injector fire on tbi. Wownot sure about the ground wires near the thermostat being that repainted it all. Thread starter b454rat; Start date Mar 12, 2020; B. b454rat 1/2 ton status. Im' really hoping its not the electronic BS for the whipple, since there is next to 0 support for this system anymore. It may not display this or other websites correctly. Was supposed to pull the cap n check things out. So dunno if fuse/relay is bad or bad connection, but they looking at it. Now what? Fixed the stupid shit I couldn't, drove it home today. With its well documented project builds, technical articles, factory specifications, photo gallery, classifieds, active message forum, product reviews and original automotive content it's an unbeatable source. 5. ignition OFF before attempting to start the vehicle. No maybe about it. We mentioned that too. For a better experience, please enable JavaScript in your browser before proceeding. then it will flash any codes stored.. 3 then pause 2 means 32 example. I never really messed with Vortecs before so this is all new to me. This ran beautiful, then this. Suddenly coughed and died. Same results. You are using an out of date browser. If you can find a diagram for the ign module that shows what "good" ohm between pins on the plug would be you can check it vs what you're actually reading. I thought it was the pump, but garage says it has 55-65 or somewhere in there, can't remember exactly what he said. Observe the security indicator. Will start and run for a few seconds if fuel is sprayed in the throttle. 6. 1995 S10 4.3 TBI Vin Z. module. Joined Jan 21, 2003 Posts 3,423 Reaction . Runs pretty good, can hear the whine of the whipple just a lil bit. CK5 has since expanded to include the classic C/K series GM Truck and Suburban as well as past and present GM models. Repeat steps 1-3 two more times for a total of 3 cycles or 30 minutes. Got the tank outpristine inside. Wasn't able to read any voltage whatsoever out of the three wires going to it. So I had to take my 96 Yukon to a garage to get it finished. I want to say my buddies '96 Tahoe had the distributor go out. Been a member for a while but haven't posted muchI've been doing the mother of all rebuilds. AT4X versions of the GMC Sierra and Canyon. Joined Jan 21, 2003 Posts 3,423 Reaction score 142 . Could be poorly grounded. Well got it running good . The o2 sensor. Got good spark at the plugs. If you still don't have pulse after you get it back together, refer to this post regarding testing: 1986 Chevy G20 Tow Rig - 5.7 TBI conversion. did you check the pressure before you pulled the tank? Well stopped by today to ask bout scanner, distributor n what not, guess they got it running messing with the fuse box. You have a check engine light scan now . Repeated with all sensors. I had other stuff to do to it, so didn't get driven around, but I would start it and let it idle, checking fluids, etc. Come join the discussion about performance, lift kits, wheels, tires, modifications, troubleshooting, maintenance, and more! no codes fine no codes . 4. The electronics for the whipple only come into play when there is boost. I didnt want to pour gas in and temp fire it. if your playing with obdII stuff anymore you best be having a good scanner to read live data to see whats missing or you can be chasing your tail all over the vehicle . Jumper terminal a&b at adl port.With key turned to on.Watch check light will flash 1 time the a short pause 2 time ..be a 12 ready to go . There are no codes/check engine light coming on. Module tested out fine. It would start on ether tho. Again12v at each pod. Have pressure. I couldn't have left it in a fish tank this whole time and had less rust. Really want to get this thing going, Im at a loss, and mechanic is too. Turn OFF the ignition, and wait 5 seconds. Premium Member. I would try to rev it, it would stumble, sometimes it would rev sometimes it wouldn't. I guess no one reads..injector pulse comes from ecm..via ignition module..pickup coil.Once ecm senses 400 rpm,s from engine it takes over. All wires look fine. But with it running beautifully one day then not the next tells me it's something simple. Will check in the morning. Turned out to be cap/rotor. What do you mean no voltage at tps? kinda hard to get codes when it needs to be running when it won't run lol. I turned the key on and tried to get a reading for voltage at the tps. Unlock tons of extra account features and support community growth by upgrading to Premium! Mechanic said it has fuel and spark, but the injectors aren't firing. . ---------- Post added at 03:30 PM ---------- Previous post was at 01:53 PM ----------, ---------- Post added at 05:09 PM ---------- Previous post was at 03:30 PM ----------, "If you're not living life on the edge, You're taking up too much space", The Fora platform includes forum software by XenForo, http://www.gmtruckclub.com/forum/shTo-Test-TBI-Distributor-Signal-Injector-Pulse, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. In May of 1999 CK5 started out as a tribute to America's favorite 4x4 utility truck. He was gonna check some wires, there was one that looked like had corrosion on it, that was for the fuel return line for the whipple. There is no check engine light or codes, Im pretty sure he checked fuses. Site locks up if I try to editafter reading up on this issue I replaced the tps with another I had. this is my whole point . That makes more sense than anything else. if its not running then lots of stuff wont set a code . When the fuel is sprayed and make a mixture with the air inside the intake manifold, and due to low pressure in the intake manifold the air/fuel mixture vaporizes that where the fuel injection ECU sensor works and send a signal to ECU to provide the right air/fuel mixture ratio, the volume of the fuel to be drawn from the fuel pump determined by the volume of the . B. b454rat 1/2 ton status. Sorry for no posts but I took lots of pics and will post extensively. I had to fix a brake line, while the hood was open I would occasionally rev it up. Now need to wait for all this BS to be over so DMV can put this thing on the road. You must log in or register to reply here. I wasn't able to get a reading at all? So tps isn't it. Controlled drip basically. Okay im back after getting my 74 Monte carlo all done and ready to sell. I mentioned the distributor to buddy, and I have a brand new one, but, thanks to no ****in garage and water getting into tote, is now junk. Buy more new parts till it stops? It would idle fine tho. Thanks. For a better experience, please enable JavaScript in your browser before proceeding. I don't know what terminal a&b is to do a jumper wire? Put new AC Delco on and runs great again. When there is boost, Then all it does is restrict the return line forcing the fuel back to the injectors. Hasn't started since. Working nites, no garage, mud for a floor, not fun. Well maybe you found the problem..was going to tell you to disconnect tps ..ecm cut ground .flood mode. looking at this will help show you whats missing .
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