Question about 1996 Chevrolet Suburban

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I have a 96 suburban 5.7....cuts off when on unlevel ground...fuel pump and regulator has been checked problem..could there be a possible cam shaft sensor problem?

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Check the wire connections, they might be loose. Otherwise it your fuel tank or the fuel sump - the dirt inside gets sloshed around and temporarily clogs the fuel admission.

Posted on Oct 07, 2009


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Power at fuelpump relay from main relay and ignition, but no signal from computer. scanner had 5 codes but after unhook battery for a while now codes. does have a open circuit listed on fuel pump

why not post the codes. ???
usa car 96, has many codes, not one, useless or not useful.
(gas cap loose excepted)
Does all lights on car work and radio, bright head lights.?
cranks robustly, ?
spark good,? ECU cuts fuel any time one of 3 park failures, fail.?
so, spark is next.
then if spark is ok then we try test fuel. (spray )0if that fails, cam belt fell off or lost time on cam, every 60k happens.(spec)

if runs and sounds ok on test fuel, good.
crank engine for 5 full seconds, release key does the scan tool show errors. NOW? it will if those 3 spark things above, are failing.
even a dead tacho line can kill all injections.
or if TPS outputpin stuck at 5v due to ground wire to it cut,at TPS,

ok now the relay.
ECU does ground the coil (see schematic?)
but only for 3 seconds, keyon, (repeats key on).
then turns off (all G16s 91+ do that 3 sec rule.)
then the relay closes, cranking full time. look now, 96 relay is on the heater box, behind the glove box, the pink wires are BINGO FUEL.

if that works 12v on pinkk, then check fuel pressure
is car a 2 door? if 2doors, the pit behind left rear tail light
see g402 ground that is pump ground and loves to rust there.(kills pump dead)
as does the pink wires there (rust), (connectors)
see 96 ecu schematic here.

read the pump page.
got 34psi

see how to fix and test pump page

Jun 04, 2016 | 1996 Suzuki Sidekick

1 Answer

96 T100 (3.4), will only run for 2-3 seconds then quit, change fuel filter, pump, cam sensor and crank sensor still won't run, but will run on ether. Where to go next?

What you are telling me is the engine is firing the plugs but not getting fuel.
When you changed the fuel pump and filter, did you check the fuel pressure at the rail ?
Are the injectors getting power and ground pulse ??

Dec 21, 2012 | Cars & Trucks

2 Answers

I have a 96 chevy tahoe 5.7 vortec and it had a small knock in it so we put in a new crankshaft,main bearings,rod bearings,timing chain,timing cover and all seals and gaskets now the truck misses on number...

Oh man that's a tough one. It almost sounds like a bad head, however there is an electronic spark control mounted to the firewall, that could possibly be doing it. If it is fuel injected, check your injectors. Something else to check would be the fuel pressure regulator. I'll have to think more on it, because you have replaced so much. Have you checked for trouble codes? The throttle position sensor can cause some of your symptoms. Hope this helps, but I think you might have a faulty esc control (electronic spark control)

Jun 09, 2011 | 1997 GMC Suburban

1 Answer

I have a 96 suburban and it want start just turns over, so I replaced the fuel pump and still nuthing, someone said cam sensor, but what about a crank sensor? How can I tell with no engine light on for a...

check for spark at the plugs..if you have spark..get some auto mobile starter fluid ..spray some in engine intake.. if engine starts have a fuel deltvery problem..that should narrow your your problem down..your fuel pump might be good..there are other parts in your system that will cause pump not to work.. such as plug fuel filter/pump relay..ecm..fuel pump fuse etc..take it one step at a time..guessing is costly

Sep 13, 2010 | 1996 Chevrolet Suburban

2 Answers

96 f350 diesel stops after warm like key turned off.

Sounds like your fuel shut off solinoid is getting hot its failing and needs to be replaced,I hope this helps you

Sep 30, 2009 | 1996 Ford F350 Crew Cab

1 Answer

Suburban low pressure from fuel pump

Try checking the fuel filter and then the pressure regulator on the rail. If the pressure regulator is bad it will not let the pump push enough pressure. And if the filter is clogged then it will also not let the engine get enought pressure. I have seen pumps starter going out by losing pressure. I have also seen aftermarket pumps quit after about a week unles you did not change the whole assembly.

Sep 27, 2009 | 1999 Chevrolet Suburban

1 Answer

1999 chevy suburban fuel pump or what????

could possibly be either cam position sensor or the crank position sensor if the fuel pump doesnt read the signal from them it will not start

Aug 17, 2009 | 1999 Chevrolet Suburban

1 Answer

I have a 99 suburban that has 203,000 miles. It has developed a problem of taking a while to start. I have replaced fuel pump twice, the latest was about 3-4 years back. I have not checked pressures but...

I believe you have a fuel regulator weak or dirty injectors.
Try turning the key to the "on" position ( do not try and start) wait until fuel pump stops running (3-5 seconds or so ), turn the key off and immediatly repeat for 3 cycles. On the 4th key rotation, start the vehicle. Does it seem to start up faster?
If so, the regulator is weak, however, the fuel pump does have a check valve in it to prevent fuel from leaking back into the pump and maintain line pressure.
Try the diagnostic proceedure above first and we can go from there.
Good luck, let me know.

Jul 15, 2009 | 1999 GMC Suburban

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