96 Riv has fuel pressure and spark but WONT START

96RIVMANN wrote:

Minnetonka

I'm still out in Cottage Grove.. We need a Riv meet out here.. just need a few more Minnesnowta guys

Have you pulled the fuel rail to see if your getting fuel spray through the injectors or have you hooked up a noid light to see if your getting electrical pulse to the injectors?

I have injector pulse good fuel pressure and spark. I just checked everything for the millionth time to bi sure. I checked and cleaned all the grounds. Pumped out the cloudy gas that was in it and replaced it with gas that looks clear like water. I tested fuel pump circuit. Checked the computer for codes. Replaced crank position sensor and fuel filter. All this and still no start, won't even try! Has 40 psi fuel pressure when cranking. Any other suggestions? I'm running out of patients its been a month. I'm going to take it to a shop if I can't figure it out by friday. Please help!!!

Also replaced spark plugs because the ones that were in it looked original to the car.

If it were me and I knew a trusted shop that was AC Delco certified, I would have the car towed there tomorrow.
I know thats not what you want to hear but sometimes another set of eyes and another brain is all it takes to be able to find something that otherwise be obvious. Hopefully it wont be too expensive to repair.

Good Luck

Bert

Did you say it would run on brake cleaner? After replacing the gas, maybe the plugs are so flooded/fouled they won't get things started... see if it will start from the brake cleaner trick again.

If it will run on brake cleaner, you know it's a fuel related problem. If you have fuel pressure, watch for injector pulse (you can see it a little with a simple test light, but you should really use a noid light, whatever that is) while it's cranking/running on brake cleaner...

My fuel pump died so I bought a brand new one and put it in. It holds fuel pressure longer now but still drops to 0 after about 2 to 3 minutes after the fuel pump is shut off. I did the brake cleaner truck the other day and it ran great!! So far ive replaced spark plugs fuel filter crank sensor fuel pump and drained my gas out and replaced it with better looking gas. Any other suggestions?

If the pressure is dropping like that your injectors aren't closing, they are probably dirty. I mean dirty beyond what in-fuel cleaners can do, they should probably be sent out for a real cleaning. (See my injectors thread in the 'for sale' section if you want to make it easy)

But that shouldn't be keeping you from running.

I put a test light across the injector pins and it would blink on and off dimly. That tells you the signal is being sent to the injectors. That's about all you've got at this point.

Check the voltage at the injectors too, make sure it's correct.

Looking around I noticed my LIM is leaking antifreeze and my oil level seems quite high. Maybe my gasket blew out? I don't recall the temp being high but maybe it leaks enough to make it not run? I'm thinking that or a leaking injector, since the pressure still drops. So far 400 dollars invested with no result!

If you are sucking antifreeze into the cylinders you'll have some issues running. If you pull the plugs right now, are they wet?

Lower intake manifold gaskets are known for failing. In '05 or '06 they revised it to an aluminum gasket instead of plastic.

deekster_caddy wrote:

If you are sucking antifreeze into the cylinders you'll have some issues running. If you pull the plugs right now, are they wet?

Lower intake manifold gaskets are known for failing. In '05 or '06 they revised it to an aluminum gasket instead of plastic.

This is a very very common problem with most of the GM V-6's. My friend has bought at least 20 cars cheep to fix then sell for a profit!! Most people look at it and think it's the Head Gasket when they find water in the oil.

mine did that awhile back but i keep mine running and let it dry running, but cs, is my best guess as well

steve96 wrote:

Looking around I noticed my LIM is leaking antifreeze and my oil level seems quite high. Maybe my gasket blew out? I don't recall the temp being high but maybe it leaks enough to make it not run? I'm thinking that or a leaking injector, since the pressure still drops. So far 400 dollars invested with no result!

just a thought, if your losing pressure because of open/leaking injectors, it could be flooding your motor. plugs are wet with fuel right?

steve96 wrote:

I have injector pulse good fuel pressure and spark. I just checked everything for the millionth time to bi sure. I checked and cleaned all the grounds. Pumped out the cloudy gas that was in it and replaced it with gas that looks clear like water. I tested fuel pump circuit. Checked the computer for codes. Replaced crank position sensor and fuel filter. All this and still no start, won't even try! Has 40 psi fuel pressure when cranking. Any other suggestions? I'm running out of patients its been a month. I'm going to take it to a shop if I can't figure it out by friday. Please help!!!

i had the same problem, the issue was ignition related. i put the wrong year model pcm in my 96 and blew something in the ign. i know you didnt do this, but we found one of the ign hot wires going into pcm was dead. we ran a hot jumper wire and it started right up. if its your ign switch in your, ive got a replacement.

Hmmm... I still don't know if your PCM got wet, nor if the "SECURITY" light is on or flashing.

Albertj

So did anyone find the solution? Im going through this same bs!

Did you check to see if the Fuel Injectors have a pulse signal? Fuel pressure does no good at all if Injectors don't have pulse.

Yes they have pulse, it has spark and fuel. I can hear the pump come on. Do you think the PCM has anything to do with it?

I was replacing a fuel line on my 96 rivi. I started it up ran fine but noitced it was leaking from the connector on the line. Cut the engine off and gave it a rest. I then pushed the connector on tighter and went to start the engine would not start. Help please!!!!

rodrivi wrote:

Yes they have pulse, it has spark and fuel. I can hear the pump come on. Do you think the PCM has anything to do with it?

Just because the pump comes on, and there's fuel at the rail, doesn't mean that the fuel is making it into the engine. Did you install a NOID light on an Injector connector to see if it is in fact pulsing?

Not quite sure how this would relate to your repair.....
I would start by cycling the key a few times and let the rail fill up. You might have air in it. Did you forget to plug something back in? Is a line kinked? Just throwing out ideas.

Got home from work and it started right up.