Question about 1976 Cadillac Eldorado

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I have a 1975 cadillac eldorado. It has the throttle body and fuel injectors. While driving at low speed (10- 30mph) the car hesitates and jerks . I give it more gas and the jerking and hesitation goes away. At higher speeds while holding the accelerater steady, the speed fluctuates. I have replaced the fuel filter, fuel pressure regulator and the throttle position sensor. I have not checked the fuel pressure or began to troubleshoot the fuel injectors.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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chuck943
  • 783 Answers

SOURCE: 2007 Lincoln MKZ, very intermittent transmission hesitation

This is going to be either a programing issue in the transmission control module or an main control valve body concern. This vehicle is under warranty for 48 months or 50000 miles so I would have my local dealer take a look at it.
Ford has a new techincal service bulletin out on a concern similar to what you are describing. It states that if vehicle has less then 20000 miles to reprogram the PCM and TCM, if it has over 20000 miles they recommend to replace the main conrol valve body. The TSB number is 08-24-01

Posted on Mar 09, 2009

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emissionwiz
  • 83772 Answers

SOURCE: Hesitation problem

try cleaning the inside of the MAF sensor and do the following procedure as well.
Here is the most common cause of surges and stalls at stops and low erratic idle speed and rough idle, it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Posted on Mar 24, 2009

  • 3 Answers

SOURCE: 2004 Suzuki Verona hesitating and jerking with ck eng light on

I've got the same make/model and issue. I've got a mechanic I trust who changed the spark plugs and pc valve (about $200). The problem has persisted and he's telling me we need to change the spark plug wires which I avoided because they were going to cost me $120 @ Autozone. So I knew if I'd ordered through my mechanic or the dealer they would have been twice that not including labor. If it doesn't work...I'll be calling click and clack.

One thing I can say...is that this car is the best example of why you need a trustworthy mechanic. Someone who is willing to try and eliminate an issue one at a time versus what they did to you. I really love my car and have grown to realize the parts are hard to find and rival BMW's in price. Find another mechanic...and if when you buy a part for routine maintenance...buy two.

Posted on Apr 13, 2009

  • 3 Answers

SOURCE: hesitation and jerking

tcc sylinoid is bad go to autozone let them check with there computer its free to check it same problem for lots of 04 05 impalla andmonty owners

Posted on May 07, 2009

AskJack
  • 117 Answers

SOURCE: 1991 cadillac deville 4.9 fuel trouble

You just need to go through a simple Idle Relearn Process.

The Idle Speed Control motor will cause the accelerator pedal to tap and the car will surge back and forth, actually acting like there is a lack of power during intial startup.


Whenever a battery is changed, went dead or the ECM computer is replaced.

In order to make the engine run normal again, you need to take the car through a relearn process. Otherwise the idle could be very slow or have a 30mph idle.

To enable it to relearn, here's what to do.

1) Disconnect the battery cable for 15 minutes, before hooking it back up.

2) (KOEO) Turn the Key On with Engine Off, just so the electronics are on, but without starting the engine and turn the climate control panel to off.

3) Push the off and warmer buttons on the climate control panel at the same time and hold for up to 5 seconds for the computer to go into diagnostics.

On the fuel panel screen it will display 888 then E52 and then 70.

When it gets to 7.0 shut off the key for 1 minute.

4) Repeat step 3, two more times.

5) Start the engine without pushing on the accelerator pedal and let it run for 18 minutes with the climate control panel off.

6) After 18 minutes put your foot on the brake and shift into drive and wait 1 minute.

7) Then turn on the a/c by pushing the auto button. It needs to be warmer than 60 degrees F so the compressor can engage. Wait 1 more minute.

8) Put the shifter back in park and turn the key off.

9) Wait 1 minute

10) Idle relearn is now complete and the engine should start and run correctly.


Posted on Sep 16, 2009

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Chevrolet problems


What engine, what year model? When you get down to about an 1/8 th of a tank pour a big bottle of SEAFOAM gas treatment in you tank. Then go run it out at high RPMs low gear our 100 mph doesn't make any difference. What this will do is clean your fuel injectors and plugs. Think of fuel injectors like a bottle of wind spraying fuel at your spark plugs. If the nozzle on the bootel is plugged it won't mist well, same with fuel injectors slow city stop and go traffic leaves carbon deposits on the "spray nozzle" this will cause hesitation in stop and go. If your savy about throttle bodies if it has more that 80k you need to pull it and clen it. Throttle body plates and intakes+ the senosors that go with it really get carbon up bad. Make sure you use the throttle body cleaner and oxeygen sensor cleaner exactly where you should this one project you cat just brake fluid to clean with. Hope that helped, oh 3rd possible but not likely cause fuel filter slightly plugged. Send back data on miles, size of engine, year, make, If this doesn't solve your problems, do you have any check lights on? Bret

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Sir, your question is not very clear, but I will still try to post a solution here. Engine missing could be due to any problem in fuel system, ignition system, engine or ECM as well.

LOW ENGINE IDLE SPEED (Poor idling):
-Throttle body (do the cleaning and idle speed learning)
-A /C signal circuit
-Fuel pump control circuit
-Fuel pump
-Intake system
-P C V valve (clogged or open) and hose

ROUGH IDLING:
-Cylinder Compression
-Ignition system (Igniters, spark plugs, wiring harness)
-Spark plug fouled, gap too wide or too short. (1.00-1.1 mm)
-Fuel injector circuit
-E C M power source circuit
-Fuel pump control circuit
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-Throttle body (cleaning)
-Intake system
-P C V valve and hose
-Air fuel ratio sensor
-Heated oxygen s ens or
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-Throttle body
-Intake system
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-Air fuel ratio sensor
-Mass air flow meter

HESITATION/ POOR ACCELERATION:
-Fuel pump control circuit
-Fuel pump
-Spark plug
-Ignition system
-Fuel injector circuit
-E C M power source circuit
-Mass air flow meter
-Throttle body (do cleaning)
-Intake system
-Valve timing
-Cylinder Compression


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Most likely a dirty idle speed control system follow the guidelines below to clean it.

Throttle Body Cleaning on vehicles without electronic throttle control (most 2003 and down)

You can in most cases repair this slow speed stall or unstable idle by cleaning the engine throttle valve and the idle speed control valve using a product called CRC Spray Throttle valve cleaner. Spray the cleaner into the air intake of the engine with the hose removed from the throttle body, the engine will try to stall so hold up the idle speed manually. Once you have used up about 1/2 can of the cleaner stall the engine out while spraying and turn the key off, disconnect the negative battery cable for 5 minutes and then reconnect and drive the car for a about 25 miles of varied driving modes. If this doesn't cure the problem you may need the fuel injectors professionally cleaned by the dealer service dept.

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