terryman

[ernwilson@msn.com]

can anyone tell me how to remove glow plugs from air heater on terracan inlet manifold. i suspect they might not be working. i get grey smoke and engine a bit lumpy on first start up then everythings fine when engine warm cheershttp://www.hyundai-forums.com/images/smilies/sad.gif

[Em-squared]

Just want to say

[RBURGOSS]

Originally Posted by ernwilson@msn.com

can anyone tell me how to remove glow plugs from air heater on terracan inlet manifold. i suspect they might not be working. i get grey smoke and engine a bit lumpy on first start up then everythings fine when engine warm cheershttp://www.hyundai-forums.com/images/smilies/sad.gif

Welcome to the forums

Those two preheating glow plugs can be removed by first removing the intercooler core and the short hose that attached to the intake manifold. Both elements can be inspected from the above intake hole and removed if necessary.

But before you go through all this hazzle, I suggest checking first thing in the morning (with a regular voltage tester) if the glow plugs are receiving any voltage upon switching to ignition on. Have in mind that this voltage signal may be very short (2 to 4 seconds only under cold weather), but enough to show at any voltage tester. If no voltage is detected, then you should test the glow plug relays for operation.

Let us know your findings.

[ernwilson@msn.com]

thanks for lnfo i will check for voltage at glow plugs but i dont know where the relays are. my terracan is a 2004 and ive got 99400 trouble free miles on the clock but i havent got a workshop manual. cheers mate.

[RBURGOSS]

Originally Posted by ernwilson@msn.com

thanks for lnfo i will check for voltage at glow plugs but i dont know where the relays are. my terracan is a 2004 and ive got 99400 trouble free miles on the clock but i havent got a workshop manual. cheers mate.

The glow relays should be inside the engine compartment fuse and relay box. Here is the service manual pages to test the glow relays:

[ernwilson@msn.com]

i have checked voltage at glow plugs and found 12v on no1(e91) but none on no2(e92) ouside temp is 1degree c. would i expect both glowplugs to be working or just one.i can hear relays clicking but they dont seem to be in box in engine compartment.

[RBURGOSS]

Originally Posted by ernwilson@msn.com

i have checked voltage at glow plugs and found 12v on no1(e91) but none on no2(e92) ouside temp is 1degree c. would i expect both glowplugs to be working or just one.i can hear relays clicking but they dont seem to be in box in engine compartment.

Hmmm... at -1°C, both plugs should receive signal for at least 3 to 5 seconds.

Do the next test. Disconnect both cables attached to both glow plugs. Measure resistance between center connector of each glow plug and a grounding point in engine intake manifold. Both plugs should measure resistance. If one does not measure at all, it means its broken and should be replaced.

[ernwilson@msn.com]

ok i wil do that but there is only 12v on one glow plug and 0v on the other. i cant do much today its snowing big style.

[RBURGOSS]

Originally Posted by ernwilson@msn.com

ok i wil do that but there is only 12v on one glow plug and 0v on the other. i cant do much today its snowing big style.

I understand. Have you had the chance to scan car for error codes? If you do, look for error codes 0380, 0381 and 0382.

If you discover error code 1140, it means your MAFS-IAT sensor is bad (air flow and intake air temp sensor). This sensor is located right behind the air filter at the duct. If this sensor gives wrong signals, it may lead the ECM into "thinking" that there is no need to turn on the glow plugs for engine start.

Have in mind that if one or both the glow plugs are not turning on, it may be for one of the following reasons:

1) Glow plug (either or both) are bad.
2) Glow plug relays (either or both) are bad.
3) Both plugs and relays are good, but wiring between them is bad.
4) Both plugs and relays are good, but the ECM is not turning them on at startup, because it thinks they are not needed. The ECM will think the glow plugs are not needed if the ambient temp is above 15°C or or thinks that the engine is already warm. False air temp readings will come from the MAFS-IAT sensor. False engine temp readings will come from the ECT sensor (ENGINE COOLANT TEMP SENSOR).

[ernwilson@msn.com]

thanks for your help but i will leave it untill weather picks up its -6c outside. i am 72yrs young and feel the cold more. also i cant find glow relays. cheers rob.