So i jumpered the hot to fuel pump and now the check engine light works. Speculation, but it seems to make sense. I'm going to say start with the filter.
You'll never get it pefect, as this is a bit mickey mouse, but it will help a ton with people running a big cam with their TBI. Sounds like what happened to my '89 350. Would it cause it to push too much fuel? But yeah, if you need a sending unit, then I could see the price. If you can adapt a fuel pressure test gauge in the fuel system it's acceptable.
Mine is the dribble, like the one on the right. 39, and for the fuel side is $107. If it is, you may still need a fuel pump. Any time your vehicle is experiencing a leak, it should be inspected by a technician right away, especially fuel leaks. I went for a test drive and checked a number of things. A leaking injector often causes a misfire on the cylinder it's leaking into. Forum Jump|| Forum Permissions. Warning Signs Of A Bad Fuel Injector. Most important I think is the BLM, never gets above 108 while cruising at 65mph and the Integrator varies from 113 to 129. Replaced the entire lower half of the motor and rebuilt the original GT40 heads. Sounding more and more like a weak fuel pump. On a side note, when I tried to restart it let out a backfire so loud the geese all flew away, and the cap on top of the muffler blew off. This message has been edited by phonedawgz (edited 04-19-2011).
Ignition all replaced. If you see fuel on all spark plugs, this could indicate another problem; most likely, your engine is flooded. Its just a stock 89k mile i'll try the map and the cts. Now if you have a good +12v signal on 10 and 15 and the headlights don't change the voltage much, then check the voltage on pins 10 and 15 but this time use either pin 13 of C2 (Black) or pin 15 of C1 (Tan?? ) Turns out it may have actually running lean. Yup…Ethanol does a nice number to the interiors of older cars that weren't designed to deal with a constant amount of E10 fuel. Tbi spraying too much fuel injectors. Can you take it out as a unit and look at the actual pump? Replace them both, unless the "sock" has collapsed inside the tank or you have another flo restriction somewhere you really shouldn't see that much pressure variation key on engine off, under idle or WOT.
Okay some how relay grounding out. Have to get this thing up by friday, heading back out again. This time right housing stayed dry but left leaked. Check wire unplugged from relay and no longer grounds unhooked. This is a new one to me! FP failing would be really odd- I don't know of a pump that fails by adding fuel. Last edited by Tx Firefighter; 11-14-2005 at 03:50 PM.
Thundrecougar said: With cross counts it's mostly important that there are some. I believe I should see spraying. Fuel injection is the process that delivers the fuel to an internal combustion engine. I tried spraying it with some brake clean while it was bogging and it reved right up! Help keep your engine running and producing power optimally by ensuring your car's fuel injectors are clean and operating at their maximum potential. I am fighting injectors flooding big block chevy in 93 rv. Tbi spraying too much fuel oil. Might be worth cutting the old filter open to see how much crud it's picked up, too. It shouldn't come from anywhere no matter the fuel pressure. Basically what I am saying is I think the real problem is either power or ground to the ECM. My car has 198000 miles.
Got parts from pull a part. If i'm buying a $150 part I really want it to be the right one. Over the course of the vehicle's life, the injectors could fire millions of times! If it's referencing nothing, then it should be constant pressure- 13psi all the time. In reply to thundrecougar: I don't think that rules out filter, but it definitely doesn't rule out pump. In reply to SkinnyG (Forum Supporter): That's a good idea. Tbi spraying too much fuel lines. I don't believe you said anything about the service engine light( if it's a stock '89, should be lit up.. check the trouble before you try to change any sensors. I replaced my injectors in my 88 4. The injector should not be squirting gas unless the engine is running, might be as simple at a bad oil switch or the temp switch causing it. 10, and 15 are powered by a fusible link, and then a ECM memory reset connector that connects to the power studs on 85 and up 2. Rough idling – You may feel like the engine is going to stall when you stop. I tested the fuel pressure today, and I am getting about 1 psi, which is way too low of course. How to Test Fuel Injectors.
We may be getting somewhere. Check all the wiring connections, grounds etc first. The Tan/Black wire from the ECM to the ICM is what the ECM uses to tell the ICM to use it's own internal ignition pulses or the ECM's modified ignition pulses. I am not sure how they send power to the ECM on the 84. That won't tell you if the chain has jumped but it will tell you if it's worn. Other thing to take a look at would be the MAP sensor, if it is outta whack, it'll mess up your fuel requirements too. And check the fuel pump sock. What makes it deteriorate like that? TBI just keeps going. There's not a lot of mods one can do on a TBI 's a slightly better exhaust crossover and a high-flow cat will help. The ECM applies a voltage and the ICM has an electronic relay that switches the ignition source. Fuel injectors can get dirty and cause an idle issue.
So far nothing changed. The o rings cause leaks but it sounds like a leaky injector. To properly evaluate a fuel pressure regulator would require hooking up a fuel pressure gauge and observing the pressure with the vacuum line connected and disconnected. You cannot vote in polls in this forum. It's the regulator that makes the TBI work. Posts: 17078 From: Green Bay, WI USA Registered: Dec 2009. Obviously, let's get the driveability issues sorted first, though. I'm stumped, I have a lot of info from the diagnostic but don't have the experience to know what is right and what is wrong. Got same issue in my 1990 K1500 5. Too Much Fuel, Fuel Injector Problems. '71 SNB 350, auto, pretty. Your pump always has to be able to move more fuel than the injectors are moving in order to maintain the pressure setpoint.
If you want to go lower you can tee off the feed line and into the return line, if you want to go higher you can just put it inline with the return line.
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