Question about 1991 Chevrolet Camaro

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91 camaro vacuum leak?

New fuel pump, fuel injectors, new alternator, new battery... Heard it could be a vacuum leak and I found four loose hoses... not sure how to connect all vacuum hoses... Was running after I got it smogged... They reset computer and it ran for a day then stalled. Runs for a little but like it misfires until it dies

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CHECK SPARK PLUGS AND TIMING ~~( ALSO TUNE UP DISTRIBUTOR CAP, EGR, O2 SENSOR) , VACUUM WILL CAUSE LOOPS BUT WONT CUT CAR OFF

Posted on Dec 07, 2013

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

Diesel13
  • 11 Answers

SOURCE: 1995 Chevy Cavalier 2.2L Automatic

Check your egr vavle. i had this problem with my old cavalier and it was as easy as removing it and cleaning it. It's probably plugged up with carbon

Posted on Aug 27, 2008

  • 295 Answers

SOURCE: HELP! HELP! SOMEONE PLEASE ! 2001 chevy blazer fuel problems

I would check to be on the safe side the fuel filter is going in the right direction. The arrow is pointing towards the engine away from the fuel tank, Then you need to make sure the fuel pump wiring connections are good contact and did not come loose when driving.

Posted on Mar 18, 2009

  • 206 Answers

SOURCE: start fine but dies instantly

Have you checked your fuel pressure. I run a shop and I have got bad pumps before

Posted on Apr 07, 2009

  • 1 Answer

SOURCE: 91camaro 3.1 wont start

Try your ingition control mod, located on distributor. Had problem with my 89 and replaced that and fires up everytime now.

Posted on May 01, 2009

joecoolvette
  • 5660 Answers

SOURCE: 1990 camaro was bought 3 weeks ago has a

I believe it is electrical, and someone,
1.Has tried to bypass the use of the correct ignition key,
2.Or a fusible link for the starter is blown.

Does the ignition key have a chip on the side of it? The 1990 Camaro uses an ignition key with a resistor on the side of it. (Chip)

I had a guy install a radio, cut many wires, then wired it up wrong.
I found fusible links in the engine compartment that were blown, and wires that weren't hooked up correctly.
Took a couple of days, plus the wiring schematic for the engine compartment, and interior, to figure out what he had done!

My suggestion would be to find out if the ignition key fits THAT car first. (Dealer info)
Find out if it's the correct steering column.
Then look under the engine compartment to check out the starter wiring. You'll need 1990 Camaro wiring diagrams.

The prior owner bypassed the ignition switch with that push button momentary switch, because either/or a fusible link has melted through, or it is the wrong ignition key. (And maybe a different steering column complete with key switch!)

The 'Chip' on the key is a resistor, and THE correct resistance is needed to bypass the theft deterrent system.

Posted on Sep 04, 2009

Testimonial: "Thank you! Now it's starting to make sense, we will have that checked out if possible"

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2 Answers

Why is my '94 Camaro V6 idling too high?


Changing a fuel pump shouldn't affect the idle.Was it ok before the pump was changed? Look for any source of vacuum leak under the hood from the hoses causing unmetered air to enter the engine. Make sure the throttle is not stuck open slightly. Is the check engine light on? If so have the codes scanned for possibleTPS or IAC problems

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91' camaro rs 305 is losing horsepower when im driving and engine lopes when in idel


HI. Engine loping at idle in a stock RS camaro will likely be caused by bad fuel injectors. The throttle body on your car has two large injectors and usually the drivers side will short out leaving the passenger side over-working. You can see this occuring if you remove the air cleaner lid and use a very bright flashlight to look at the spray pattern for both injectors. They should look the same roughly. There could be a vacuum leak at the MAP sensor hose, there could also be stuck open EGR valve as well, commonly there is a problem with the Engine Coolant Temperature sensor and wiring connector that may be the cause of your problem. As far as the vapor leak in the fuel system, check the fuel hoses near the gas tank and the smog canister under the hood for cracks or broken places. I have had to replace many fuel pump o-ring seals on these cars though. The spot where the fuel pump hanger mounts into the fuel tank has a large diameter o-ring that cracks and splits very commonly, also if the fuel pump was replaced, sometimes people don't quite get the seal to stay in place just right.

Aug 10, 2012 | 1991 Chevrolet Camaro

1 Answer

I do not get a start up pluse on 91 Camaro RS 305


I assume you are not getting fuel spray from the injectors ?
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Jun 23, 2012 | Cars & Trucks

1 Answer

I have a 91 camaro just got the fuel pump change n fuel filter also cleaned out the injectors in still won't start up full turn n my dash board wus workin just fine now its not working just got a new...


ask a local mechanic to have a look ,you may have left a power supply cable off from the positive terminal ,as for the non start then check for a spark and if a spark then check the fuel pressure it should be 55lbs on the injector rail is a tyre valve looking connection check the fuel pressure here

Apr 28, 2012 | 1991 Chevrolet Camaro

1 Answer

I have a 95 camaro with a 3.8l. It had a #1 cylinder missfire code, I found out it had a bad fuel injuector so i replaced it. Now, it's showing a random misfire code. What could cause this change


An intake vacuum leak can cause this as well as other issues, read about it below.
Check Engine Light On, P0300 Random Misfire Code A random misfire means your engine is misfiring, but that the problem is not isolated to one or two cylinders. It is jumping around in a random way from one cylinder to another. A random misfire code usually means the air/fuel mixture is running lean. But the cause might be anything from a hard-to-find vacuum leak to dirty fuel injectors, low fuel pressure, a weak ignition coil, bad plug wires, or compression problems. Even a dirty MAF sensor can cause a lean code and/or misfire to occur. The engine may be stalling because it isn't getting enough throttle opening. The cause is often a problem in the idle air control system. The first thing to check is the intake vacuum with a vacuum gauge. On most vehicles a normal reading is 17 to 21 inches Hg. If the needle is lower, is jumping up and down or steadily dropping, you have a vacuum problem. Look for possible vacuum leaks by checking vacuum hose connections, the throttle body and manifold, and PVC valve and plumbing. An EGR valve that is leaking can also act like a vacuum leak and cause a random misfire. The next thing you should check is the fuel pressure with a gauge. If it is not within specifications (refer to a service manual for specifics because fuel pressure is critical for proper engine performance), the problem may be a weak fuel pump, low voltage to the pump (check the relay and wiring), or obstructions in the fuel line (like a plugged filter). A bad fuel pressure relay can also leak pressure and prevent an otherwise good fuel pump from delivering full pressure to the injectors. Dirty injectors can also restrict fuel delivery and cause a lean fuel condition. Many regular grades of gasoline do not contain adequate levels of detergent to keep the injectors clean. Frequent short trip driving accelerates the buildup of injector deposits. Cleaning the injectors with a good quality fuel tank additive (or having them professionally cleaned) can solve this problem. Look at short term fuel trim (STFT) and long term fuel trim (LTFT) with your AutoTap Express DIY. If the numbers are high, it tells you the engine is running lean

Jul 27, 2017 | 1995 Chevrolet Camaro

1 Answer

Gas is leaking from my fuel rail (phlegm) on my number 5 fuel injector on my 1994 camaro


  • Park the Camaro on a flat, level surface and set the parking brake. Open the hood and secure it in place with the hood prop. Disconnect the negative battery cable.
  • Open the gas tank to relieve pressure on the fuel lines.
  • Remove the sight shield from the fuel injector with a socket wrench. Loosen the screws on the hose clamps and disconnect the fuel lines connected to the injectors. Keep a rag handy to catch any fuel that leaks.
  • Disconnect the vacuum hose and ignition coil wire, then unplug the electrical connectors. Remove the fuel injector mounting bolts, undo the retaining clips and remove the fuel injectors.
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  • Plug the electrical connectors back into the fuel injectors. Reconnect the vacuum hose and ignition coil wire. Connect the fuel lines and tighten the hose clamps with a screwdriver to secure them in place. Bolt the sight shield in place with a socket wrench.
  • Place the gas cap back on. Reconnect the negative battery cable



  • Dec 06, 2010 | 1994 Chevrolet Camaro

    1 Answer

    91 camaro 5.0 5sp no injector pulse and no power to fuel pump


    Using a multimeter check the wiring for power at the pump and at the relay. It sounds like a bad relay.

    Jul 19, 2010 | 1991 Chevrolet Camaro

    1 Answer

    How do i chage the fuel injector for a geo metro 1997 LSI?


    REMOVAL & INSTALLATION Fig. 1: Removing injectors from fuel rail 84245032.gif
    Fig. 2: Make sure injectors rotate freely in cylinder head 84245033.gif
    1. Relieve fuel system pressure and disconnect the negative battery cable.
    2. Remove intake air hose between throttle body and intercooler.
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    22. Install throttle position sensor coupler.
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    26. Start engine and check for leaks.
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    Jul 03, 2010 | 1997 Geo Metro

    1 Answer

    91camaro 3.1 wont start


    Try your ingition control mod, located on distributor. Had problem with my 89 and replaced that and fires up everytime now.

    Apr 28, 2009 | 1991 Chevrolet Camaro

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