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got no spark

Sent to Car Experts June 12 12:45 PM

just put in a rebiult engine we did the work on it. will turn over but on spark. help, it could be a long,long walk home. auy sugustions?

Customer (name blocked for privacy)
Status:  Closed   Value: $10
Info Request
June 12 12:52 PM (6 minutes and 54 seconds later)
         
REPLIED to Info RequestCheck Mark

Might be a good idea to tell us what we're working on here.

Make, model, year and engine size

Is it exactly the same as what came out?

Tech501 -- Auto Service Technician -- 96% Positive Feedback on 740 Car Accepts
38 years exp, ASE Mastertech with L1 Advanced Engine performance
Reply
June 12 1:03 PM (10 minutes and 12 seconds later)
         
Reply to Tech501's Post: 89 jeep charokee.4.0, 6cy, atuomatic. We have fuel, checked spark plugs,fuses, timing, basicly all the ovious.
Customer (name blocked for privacy)
Reply
June 12 1:07 PM (4 minutes and 55 seconds later)
         
can you help?
Customer (name blocked for privacy)
Info Request
June 12 1:08 PM (46 seconds later)
         
REPLIED to Info RequestCheck Mark

You need to test 3 basic functions to know where to go from here.

  1. Check for spark at the plug end of the wire (already done)
  2. Check for injecter pulse using a noid light (shown below)
  3. Check fuel pressure using a fuel pressure gauge.

Once we know which of these is dropping out, we'll know which system is having a problem.

Images available only to Customers.

Tech501 -- Auto Service Technician -- 96% Positive Feedback on 740 Car Accepts
38 years exp, ASE Mastertech with L1 Advanced Engine performance
Reply
June 12 1:18 PM (9 minutes and 55 seconds later)
         
Reply to Tech501's Post: Coil tests ok, fuel pressure is ok. Should we have 12 VDC at the coil input when cranking?
Customer (name blocked for privacy)
Info Request
June 12 1:28 PM (10 minutes later)
         

What is the fuel pressure?

Do you have injecter pulse?

Tech501 -- Auto Service Technician -- 96% Positive Feedback on 740 Car Accepts
38 years exp, ASE Mastertech with L1 Advanced Engine performance
Reply
June 12 1:35 PM (6 minutes and 59 seconds later)
         
fuel pressure is almost 40 psi. how do we check the injector pulse ?
Customer (name blocked for privacy)
Answer
June 12 1:48 PM (13 minutes and 20 seconds later)
         
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Tech501 -- Auto Service Technician -- 96% Positive Feedback on 740 Car Accepts
38 years exp, ASE Mastertech with L1 Advanced Engine performance
Reply
June 12 2:07 PM (18 minutes and 10 seconds later)
         
why do you think it has to do with fuel? is there something with it that messes with computer or ignition? not being smart, just we are about 30miles from parts store. and REALLY far from home!
Customer (name blocked for privacy)
Answer
June 12 2:12 PM (5 minutes and 48 seconds later)
         
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Tech501 -- Auto Service Technician -- 96% Positive Feedback on 740 Car Accepts
38 years exp, ASE Mastertech with L1 Advanced Engine performance
Reply
June 12 2:23 PM (10 minutes and 54 seconds later)
         
did test CPS at plug, got open reading = no continuity. what value should it be?
Customer (name blocked for privacy)
Reply
June 12 2:27 PM (3 minutes and 14 seconds later)
         
cuold we use a digital multi meter?
Customer (name blocked for privacy)
Answer
June 12 2:28 PM (1 minute and 17 seconds later)
         
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Tech501 -- Auto Service Technician -- 96% Positive Feedback on 740 Car Accepts
38 years exp, ASE Mastertech with L1 Advanced Engine performance
Answer
June 12 2:48 PM (20 minutes and 1 second later)
         
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Steve7654 -- Auto Service Technician -- 99% Positive Feedback on 1739 Car Accepts
27 yrs ASE L1 Master Technician, Service manager
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June 12 3:02 PM (14 minutes and 11 seconds later)
         
Ok, will try to re-install the trigger (as you suggest with the tape to space) just in case it got bumped, unit is new as of 5-6 months ago. Flywheel is correctly installed with the trigger ring, used the existing. Will turn it by hand to check for anything bent or not quite were it should be!
Customer (name blocked for privacy)
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June 12 3:08 PM (5 minutes and 45 seconds later)
         
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Tech501 -- Auto Service Technician -- 96% Positive Feedback on 740 Car Accepts
38 years exp, ASE Mastertech with L1 Advanced Engine performance
Reply
June 12 3:09 PM (1 minute and 31 seconds later)
         
thank You. again, I'm sorry for any trouble I started by having 2 open, I will do better the next time I try to log on,
Customer (name blocked for privacy)
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